The French forward has endured a disrupted time at Old Trafford with injuries disrupting his first season under the Dutch coach.
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Martial enjoyed a wonderful pre-season and looked set to play a big role for the club, but fitness problems have meant that he has missed 30 games already this term.
While the 27-year-old is back in contention now, he has a point to prove given that it's been 18 months since he last completed a full match.
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With a contract that expires in 2024, time is running out for Martial to prove himself as a key man for Ten Hag, but according to the Man United boss, he has full faith in the French star.
Ten Hag said: "I don't think it is the right moment to be the case.
"I believe in him, every time he is available he really contributes to the team performance, the level of the team is upgrading when he is available.
"We are working with him to get fit and be available."
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He added: "Every person is different - you have to treat everyone differently.
"This process you have to be careful. I do everything with a strategy behind it to get him available."