In this task, you are given an article. Your task is to summarize the article in a sentence.
--------
Question: Media playback is not supported on this device
Rooney, 31, announced on Thursday that he is staying at Old Trafford after being linked with a move to China.
The England captain has missed United's past three matches with a calf injury.
"He is fine, he has been training with the team," said Mourinho on Friday. "He made his statement about staying here exactly in the right moment."
The Portuguese added: "That should be the last question about it until the end of the season."
Rooney's agent, Paul Stretford, had travelled to China to see if he could negotiate a deal, although it is not known which clubs he spoke to.
However, United's record goalscorer released a statement on Thursday saying he hoped to "play a full part" in the rest of the Premier League club's season.
Rooney has won five Premier League titles and the Champions League since arriving at Old Trafford as an 18-year-old for £27m from Everton in 2004.
The forward, whose contract expires in 2019, has said he would not play for another English club other than the Toffees.
United are sixth in the Premier League and remain in three cup competitions, having reached the last 16 of the Europa League on Wednesday with a 4-0 aggregate victory over French side Saint-Etienne.
Rooney will be part of the squad to face top-flight rivals Southampton at Wembley on Sunday (16:30 GMT kick-off).
"No doubts, he is involved," said Mourinho.
"He was not selected for Saint-Etienne because he was not ready to play. He stayed at home this week so he could have one more important training session."
Midfielder Henrikh Mkhitaryan misses the final with a hamstring injury and Mourinho says Rooney's role will depend on which system he decides to play.
"Without Mkhitaryan, if we want to play with a number 10, obviously Wayne, it's his position, it's where he was playing with us many matches, so he is an option for me," he added.
On Rooney staying, the 54-year-old added: "He said no way he moves and wants to help the team fight for trophies. I said I would be happy if that was the decision."

Answer: Manchester United forward Wayne Rooney "will be involved" in Sunday's EFL Cup final against Southampton, says manager Jose Mourinho.


Question: Treasury Minister Deputy Gavin St Pier said the plans would "substantially add costs to running the education system".
He also criticised the lack of measures in place to evaluate the scheme.
The Education Department's plans include scrapping the Eleven Plus exam by 2019, and creating a single States high school across four sites.
Deputy St Pier said he did not think the four-site model offered best value and "it would be better to build a larger school at La Mare".
The proposals are due to be debated next month.

Answer: Education proposals which will see costs rise by "nearly £3.5m a year" will not be backed by the treasury department, a minister has said.


Question: Previous displays in Boston, Lincolnshire, have featured clusters of lights and miniature trees along its cobbled shopping streets.
But this year's simpler offering has been compared unfavourably to a living room Christmas tree by some.
Councillor Paul Skinner said the authority could no longer justify the Â£40,000 annual cost.
More on this and other local stories from across Lincolnshire
He said Boston Borough Council's Christmas lights contract came to an end this year, and it voted not to renew it.
In previous years, as pictured below, trees were lit up along the length of Church Street, with clusters of lights used to illuminate the sections across the street.
Posting on Facebook, one resident described the authority as "a bunch of miserable scrooges".
While one caller to BBC Radio Lincolnshire said her four-year-old daughter "absolutely cried her eyes out because there was nothing to look at".
She said her own personal Christmas tree had as many lights as the town centre display.
On social media, Frank Slater described the council as "a bunch of miserable scrooges" while Gina Tilling described the lights as "dismal".
Others said it looked as though Christmas had been cancelled, and Boston was "dark and joyless".
Barry Brackenbury joked that the council was doing its bit to "slow global warming".
Responding to the comments, Mr Skinner said: "It could have been better, but people shouldn't be surprised."
He said: "We've taken Â£2m out of the budget, and for the next four years we've got to take another Â£2m out."
The authority said it will look again at what can be done in future years.

Answer:
A town's "dismal" Christmas lights have prompted disgruntled residents to brand the local council Scrooges.


