Martial appears to have turned the corner at Manchester United and is on red hot form.
The France forward has scored five in his last six games after being frozen out at the start of the season and for periods last year.
He was fined in the summer after failing to return to United’s pre-season camp in America after having a child.
And his agent publicly declared he wanted to leave the club at the end of last term after a frustrating time under Mourinho.
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But his return to form has been described as a win for Mourinho, similar to getting Luke Shaw back up and running.
And Mourinho spoke about it today ahead of the Manchester derby, insisting he always knew he would come good – despite being ready to sell him in the summer.
“I never gave up,” Mourinho told MUTV. “I never gave up my feelings that this was the right way for him, even if he had to go through difficult moments.
“I knew that for him to become a really top player, he needed to overcome some barriers that I put on the road for him. It is up to his talent, because he has phenomenal talent.
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“It was just a question of him understanding what a top player is because there is a big difference between a top talent and a top player.”
Martial is expected to play a key role in the Manchester derby this weekend against league leaders City.
He has been operating from the left with either Alexis Sanchez or Marcus Rashford through the middle in the absence of Romelu Lukaku, who returned to training today.
And France boss Didier Deschamps is pleased with his progress over the last few months.
Deschamps said at a France press conference: “Anthony has been with the national team for a while now. He’s experienced both good and bad times, which is also the case for his club.
“What he’s currently achieving with Manchester United is closer to what he’s able to do regularly. I’m talking about commitment and efficiency in front of goal.
“He’s a young player and I hope he is becoming more mature. He has proved that on the pitch by how important he’s been for Manchester United for a few weeks already. It’s obvious by Jose Mourinho’s choice [to make Martial a first-teamer] and what he’s doing on the pitch.”