Anthony Martial celebrates after scoring Man United's second goal in the win over Watford
Martial had not played in Manchester United's previous two games but returned to set up Juan Mata's opener and score the second himself as the Old Trafford club stretched their unbeaten Premier League run to 16 games.
That was only Martial's third league goal of the season but Jose Mourinho, who has been critical of the £60million signing, said the Frenchman gave the sort of performance that could keep him in the team.
The United boss said: "Martial deserves the chance. He has worked harder than ever in the last two weeks in the way I like – silent but hard.
"The Anthony Martial I want is the Anthony Martial of the last two weeks of training.
Martial scoring United's second goal in the 2-0 win over Watford
"He needs to train in the way he did in the last two weeks and perform the way he did today or better because he misses a bit of confidence. I kept shouting at him to attack the defender and he needs that confidence. He is working very well."
Mourinho said he brought Martial back and dropped Marcus Rashford to improve the Frenchman's morale.
He explained: "Normally I would start with Rashford because he played very well at Leicester. But I thought Marcus doesn't need a boost and Anthony does, so I gave him this chance and he played well."
Mourinho savoured a first-half display he likened to a work of art and claimed his side are playing the Manchester United way.
Jose Mourinho hugs Martial during the 2-0 win over Watford at Old Trafford
Manchester United player ratings against Watford
Sat, February 11, 2017
Express Sport brings you our Manchester United player ratings from their clash with Watford at Old Trafford
1 of 15
How did the Manchester United players rate during their clash with Watford?
He said: "I think it is the kind of football that if it is somebody else's team, instead of being a Mourinho team, you would say it is art. But because it is my team you just say it was very good, but that is fine.
"In the first half the football was fabulous. When I got the job they were saying that at Manchester United you need to play football in a certain way and I agree.
"The first half was amazing. In the second half we got the second goal and had to kill the game. We didn't kill with 3-0 but we killed it tactically."
Even without injured pair Phil Jones and Marcos Rojo, United kept a fourth consecutive clean sheet and Mourinho added: "We have very good matches from the defensive point of view."
The manager reiterated his determination to keep Real Madrid target David de Gea, who made a fine save from Mauro Zarate, adding: "He is very important. That is why he has the contract he has and gets the money he gets."By Richard Jolly