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The Argentine, 28, lost his place in February to Gabriel Jesus, leading to speculation he might leave this summer.
"I've read a lot of the speculation on this and it's ridiculous," Al Mubarak said. "He is one of the best players in the world. He is an absolute must."
Aguero scored 33 goals in 45 games this season and is contracted until 2020. He said in March he did not want to leave.
In a wide-ranging interview, Al Mubarak also told the City website:
BBC Sport's Simon Stone:
Al Mubarak could not be any more firm in his comments about Aguero. Yet, there is an obvious truth that has to be taken into account.
City already have Gabriel Jesus who can play centrally. In addition, they have Leroy Sane, Raheem Sterling and new signing Bernardo Silva and Kevin de Bruyne who can play wide. In addition, while rumours about trying to sign Alexis Sanchez remain just that, Pep Guardiola clearly likes the Chilean.
So, if Sanchez did come, and Aguero. did stay, Guardiola would have his work cut out trying to keep everyone happy.
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Manager Pep Guardiola's debut season ended with Manchester City finishing third in the Premier League and sealing a place in next season's Champions League.
But the 46-year-old, who succeeded Manuel Pellegrini last summer after success-packed spells at Barcelona and Bayern Munich, could not help his side challenge for the title and they faced a tense battle to even finish in the top four.
Despite ending the season without a trophy, chairman Al Mubarak said their season was "not a disappointment".
"We are team now that expects to win every year at least one trophy and go further every year in the Champions League," he said.
"But, if you look at it from a different lens, we are truly going in a direction that is positive.
"Pep has introduced a new way of playing for us, an exciting way but a way that requires work and which requires a set of players that I think function within that system.
"Probably, if I look back at this season that puzzle wasn't complete and I hope this summer we support Pep in completing that puzzle."
Man City have already announced the signing of Portugal attacking midfielder Bernardo Silva from French champions Monaco, and are close to adding Benfica goalkeeper Ederson Moraes to their ranks.
Goalkeeper Joe Hart has confirmed he will be returning to Manchester City from his season-long loan at Torino, but is expected to leave City for good this summer.
Goalkeeper Willy Caballero, winger Jesus Navas and full-backs Gael Clichy and Bacary Sagna are also all departing the Manchester club.
And chairman Al Mubarak said there are clearly positions that they need to fill in the summer transfer window.
"You can see the players that are exiting right now, and that will give a clear indication of the positions that are a high priority for us to fill - full-backs both on the right and the left," he said.
"Pep relies heavily on that position and we know exactly what Pep wants.
"You should expect us to bring in a goalkeeper. We've done a lot of work on this area and our target has been set. Hopefully you'll be hearing soon what we're going to be doing in that area."
Pablo Zabaleta: "For me, he represents the essence of Manchester city - a fighter. He is someone special and if we can have 25 Pablos in our squad we would win it all. I think he still plans on playing for a couple of years - but once he hangs his boots up he will come back in some capacity."
David Silva: "He is one of the most talented players in the world and it truly baffles me. How he could be so underrated in the UK is an enigma to me. He is well respected everywhere in the world but somehow always misses out on the big awards in the UK. It's ridiculous frankly."
Yaya Toure: "He has shown us this year again and again how he can contribute to this team. Pep, as you have seen obviously this year, has a lot of trust and confidence in him. So I hope Yaya will be with us and continue his journey with us."
Leroy Sane: "He's the right age, the right talent, one of the most exciting prospects in Europe, and he's shown that on the pitch this year."
John Stones: "He is going to be one of the best central defenders in the world, I have no doubt about that. A top, top player."
Gabriel Jesus: "He is 19, one of the top future talents in the world."
Vincent Kompany: "I am absolutely delighted the way he ended the season. It's been an extremely difficult journey for him. It's not been easy watching the rest of the team play and having to deal with some of the injuries he's had. But he's dealt with it."
Manchester City striker Sergio Aguero's future has "never been in doubt", chairman Khaldoon Al Mubarak says.

The Briton, 29, needed a tournament-record three hours and 20 minutes to see off Nishikori on Wednesday.
He returns to London's O2 Arena 48 hours later knowing he must take a set off Wawrinka to ensure a semi-final place.
Murray will play the Swiss third seed at 14:00 GMT on Friday.
Nishikori takes on Marin Cilic in the evening session at 20:00, with the Japanese player also able to claim one of the two semi-final places from the John McEnroe Group.
Murray needs to qualify for the last four to maintain his hopes of ending 2016 as the world number one, ahead of Novak Djokovic.
The only way Murray can be eliminated after winning his opening two matches is with a straight-set defeat by Wawrinka, followed by a Nishikori win over Cilic.
To win the group and avoid playing Djokovic in the semi-finals, Murray must either win, or lose in three sets and hope Nishikori beats Cilic in three sets.
"Obviously it's important to win matches to give yourself the best chance to go through, and 200 points for each match here is quite a lot as well," said Murray.
Asked if he was optimistic he could recover from Wednesday's lengthy match sufficiently to challenge Wawrinka, the Scot told BBC Sport: "I haven't thought about that.
"I'm just getting up each day and trying to give the best of what I have on that day.
"I'll just try to use a good rest day to recover. Hopefully I won't be too stiff and sore come Friday, but it's not ideal to play matches of that length at this stage of the season."
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Wawrinka played poorly in a swift defeat by Nishikori on Monday but improved dramatically to beat Cilic and resurrect his hopes on Wednesday.
The Swiss, 31, lost to Murray in their only meeting this year at the French Open but won last year's group-stage contest at the O2 Arena.
And the US Open champion has no qualms about potentially knocking out the home favourite.
"I don't care at all," said Wawrinka. "All I know is if I want to have a chance to qualify, I need to win. That's all I know. That's all I'm trying to do.
"I'm going to try to play my best tennis, to beat the world number one."
John McEnroe Group qualification scenarios
Andy Murray hopes to recover from his epic win over Kei Nishikori in time to face Stan Wawrinka at the ATP World Tour Finals on Friday.

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It would be very annoying to most people but competition is a daily normality for boxing twins Gavin and Jamie McDonnell, who could become the first British identical twins to win world titles.
He would still be fighting at Donny Dome if I didn't help him out.  He got a leg-up from me
"This is massive because I don't know any other twins in the country that have done what we've done," said Gavin, who is unbeaten in 18 fights and faces Mexico's Rey Vargas, 26, for the WBC super-bantamweight title in Hull on Saturday.
"To be the first to do anything is an achievement in itself. Our kid Jamie has done a few things like that. He was the first European and world champion from Doncaster so I can't get them but to be the first twins means I get a bit of room on the stage."
The charismatic Doncaster duo, both 30, have each collected a pair of British and European titles but at different times.
Of course the main achievement that separates the two is Jamie's current status as the WBA bantamweight world champion - he has also previously held the IBF version.
Gavin turned pro in 2010 - five years after his brother - but has quickly risen through the ranks and sees his next fight for the prestigious green and gold WBC belt as a chance to step out of Jamie's shadow.
"I'm being compared to him all of the time. He's Mr Bee's Knees, who's done everything - it takes the shine off my fights," said Gavin.
"Nobody wants to be a number two at anything. He's been number one all his life and now I'm giving him a taste of his own medicine. He's number two now if I win the WBC title. He's got the other belts - IBF and WBA, but if I can say, 'who's got the best world title?' No comeback."
But with twins there's always a comeback and Jamie duly interrupts: "You then have to defend it five times to be on a level with me.
"You only have that fight because you were in my ear saying, 'Get me in with Eddie Hearn [the McDonnell brothers' promoter],' so I got him a meeting with Eddie and I said, 'help him out Eddie, will you?' He would still be fighting at Donny Dome if I didn't help him out. He got a leg-up from me."
Gavin's task on Saturday is no easy one as he goes up against a man unbeaten in 28 fights, with 22 knockouts. But promoter Hearn reckons the "down and dirty" Hull Ice Arena will give him an advantage.
"We had decent money on the table to go to Mexico for this fight but I thought Hull Arena can do strange things to a man," said Hearn.
"When you go in those changing rooms and walk out, it's a bear pit. If you're going to beat Vargas - a brilliant fighter - you have to make him feel uncomfortable.
"He has to open the door to the changing room and go 'what is this?' We need every advantage we can get in this fight."
He may seem the confident twin now but Gavin does admit he would not be boxing if it were not for his brother's achievements.
"If it wasn't for Jamie I'd be in the pub with the lads and working a 9-5 job," said Gavin, who worked as a plasterer alongside his twin.
"I never had an ambition to become world champion. I knocked boxing on the head at about 16 because I wanted to go out with my mates. But I saw Jamie at all his fights and saw him win titles. I didn't think I would do that but I wanted to have a go.
"Now I'm fighting for a world title and I believe I can win one. My brother's done it and I believe I can do it."
If Gavin cites his brother as inspiration, Jamie can now see the motivational benefit of such a close-knit rivalry.
"We push each other. Now he motivates me," said Jamie, who suffered the last of his two defeats in 2008.
"I've got to step it up otherwise people will say your brother's overtaking you and I can't have that. We're not jealous of each other. We are just born winners."
The pair are typical twins, always trying to get one over on each other in anything, from their follower numbers on social media to who could build the better house. But as their boxing profiles grow rapidly, there remains a problem.
"We get mistaken for each other all the time," said Jamie. "If someone calls me Gavin, I just go with it."
Gavin adds: "There'll be a tweet saying, 'Great to meet world champion Jamie McDonnell' and it was me. That makes me steam a little bit because I'm not a world champion yet."
There have already been world champion twins - the American Charlo brothers, Jermell and Jermall, own IBF and WBC belts in the light-middleweight division. The McDonnells aim to go one step better by one day completing the WBA, WBC, IBF and WBO four-piece set.
"We could get all four between us," said Gavin.
"The question is, whose mantelpiece will they go on? I'm sure we can collect them all in a few years because how many twins have done that? I think every fight for me now will be big fights at the top alongside him."

Can you imagine seeing somebody who is a mirror image of you trying to do your job better than you can every single day?

