Mkhitaryan moved to Old Trafford from Borussia Dortmund last summer in a £27million deal.
The Armenian international initially struggled to make an impact at Manchester United.
But he has established himself as an important part of the United side over the past few months.
Henrikh Mkhitaryan has heaped praise on Manchester United boss Jose Mourinho
The midfielder showed his importance by scoring the opener in the 3-0 victory over Leicester last Sunday.
After the win at the King Power stadium, Mourinho admitted he had been protecting Mkhitaryan when leaving him out of the team earlier in the season.
And now Mkhitaryan has heaped praise on his Portuguese manager.
Man United duo return to training ahead of Watford clash
Wed, February 8, 2017
Manchester United have been boosted by the return to training of Wayne Rooney and Timothy Fosu-Mensah after illness and injury
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Wayne Rooney and Timothy Fosu-Mensah were in training on Wednesday morning
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Henrikh Mkhitaryan has starred for Man United in recent weeks
"I believe that he has trust in me," Mkhitaryan told German outlet Bild.
"That's why I always want to give my best on the pitch for him.
"He's a special coach and expects special things, you just need to know that."
Mkhitaryan has made 14 Premier League appearances for United this season, scoring three goals.