Alejandro Garnacho inspired Man Utd to a late comeback 3-1 win against West Ham as Erik ten Hag's men progressed to the FA Cup quarter-finals, where they will host Fulham
 Sunday's 2-0 victory against Newcastle secured the Old Trafford giants' first silverware since 2017 in the Carabao Cup but the manager's immediate message to his players was "get back to work"
United looked set to be brought back down to earth with a bump after Said Benrahma put David Moyes' West Ham into a deserved lead at Old Trafford
But Nayef Aguerd's 77th-minute own goal sparked an impressive turnaround, with teenager Garnacho's superb 90th-minute effort followed by a stoppage-time strike by Fred in a 3-1 triumph
 Their quarter-final will take place on the weekend of March 18 and 19
There was a sense of relief among the delighted celebrations as Ten Hag's men progressed from the fifth-round tie despite a shaky performance, keeping their hopes of a quadruple alive
"I see today another step," manager Ten Hag said of Garnacho
 "I tell him before the game 'it's getting time you had an impact when you come on, but now you need to have impact as a starter'
"I think he is capable of it so that is the next step he needs to take
"That [fearlessness] is one of his skills
 But definitely, it is a great skill when you are fearless, when you are brave
"He is one of the players that I think has a skill that is so specific
"There are not so many players in world football who can take players on, who are capable of just going at players and out-dribble them
"But he has more skill than only that, for example, finishing
"I see he also has a big engine
 He is fast and has speed, but he can keep running for 90 minutes or 120 minutes
"United started brightly as Antony missed an effort before West Ham goalkeeper Alphonse Areola - set for a prolonged spell as starter due to Lukasz Fabianski's fractured cheekbone - denied Garnacho
Moyes' men stepped up after that shaky start and had a great chance to open the scoring midway through the first half
Benrahma fizzed a ball between Maguire and Victor Lindelof to put Michail Antonio through on goal, but De Gea spread himself well and blocked the returning striker's shot with a strong right arm
 Tomas Soucek went close from the resulting corner
Benrahma was pulling the strings and teed up Emerson Palmieri to fizz over a tantalising cross, with De Gea then denying Antonio having given the ball away in the first place
The Spaniard got down well to stop Soucek heading home a deep cross from Benrahma as the Hammers had the first chance of the second period, with Weghorst then striking wide at the other end
The sides traded attacks looking for an opener that arrived for the visitors in the 54th minute
Half-time substitute Casemiro claimed Soucek had rolled the ball out of play for a throw-in and United switched off as played continued, with Emerson cutting back for Benrahma to bend home brilliantly
United's appeals for it to be chalked off fell on deaf ears, with the goal given the green light by the VAR
Pablo Fornals lashed just across the face of goal and Antonio bypassed newly-introduced Lisandro Martinez as the Hammers threatened to take the tie away from the hosts
But Ten Hag's substitutions boosted this mentally resilient group, leading to a belated response
A well-hit Casemiro strike was denied by Areola and substitute Marcus Rashford hit wide from distance, before Old Trafford erupted when Casemiro headed home Fernandes' free-kick in the 72nd minute
But those celebrations were cut short as the substitute had clearly strayed offside, meaning the VAR review was needlessly dragged out
West Ham's travelling fans lapped up that moment, only for their night to go downhill rapidly from the 77th minute
Again it was a Fernandes set piece at the heart of it, with players rising to meet his corner and visiting defender Aguerd inadvertently heading his own goal
Garnacho had penalty appeals ignored and Casemiro saw a header saved as the hosts pushed for a late winner, with Fernandes seeing a dangerous cross cut out
That intensity eventually brought two late goals as United sealed progress
Weghorst saw a shot blocked and the ball looped up in the air, with Garnacho taking a touch before coolly striking home a right-footed curler in front of the Stretford End
Fred added the gloss in the fifth minute of stoppage time, smashing in after Weghorst pressured Aguerd
 pundit Roy Keane hit out at David Moyes' Hammers for a "shocking" second-half display, accusing the Londoners of gifting United three goals
Asked if he ever felt that West Ham would hold on for a win, Keane told : "It never happens
 Seen it all before
 They come, get a bit giddy, get an opportunity
"Loads of teams, the Spurses of this world, they come to Old Trafford, get a few chances and they get all excited and they end up getting beat
"Defensively, West Ham were shocking
 Absolutely shocking [and] useless in the second half
 They gave up three goals!"Give United credit, you knew there would be a reaction
 The really good games find a way to win
 We saw the set-piece delivery at the weekend, and contributions from substitutes
 Fred scored
 But there are no surprises at what we've seen tonight
"I've seen it over the years, West Ham are laughable
 You get chances, you've got to take them
 You talk about small margins, players have to do their job!"Asked about the role of West Ham goalkeeper Alphonse Areola in Aguerd's own goal, Keane added: "The goalkeeper has to come out there
 I remember the goalkeeper coach I used to work with used to say: 'Come out with violence
' You come and take people out
"But you look at [Areola and his West Ham defenders] there and they're having a discussion like they're in Starbucks
"Go and take people out
 Come with violence
 That's your job
"Man City vs BurnleyMan Utd vs FulhamBrighton vs GrimsbySheffield United vs Blackburn visit Liverpool in the Premier League at Anfield on ; kick off 4
30pm
 visit Brighton at the Amex Stadium on Saturday; kick-off 3pm
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>
<PAD>