"He has a very big potential," Mkhitaryan told Sky Sports.
"For him, it is a little bit hard because he is still 23 years old and maybe he is thinking he needs to do more than he's doing but I know with the manager he is going to find the solution to solve it and he's trying to do it already.
"Maybe people are waiting for something extraordinary from him, some miracles, but everyone has to know he's a football player, a human being, so he just has to play the way he can play and he will do better."
Sixth-placed United travel to champions Leicester City, who are 16th in the table and two places above the relegation zone, on Sunday.
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"It doesn't matter which position they are in now, they are going to play every game as a final because they are in a dangerous position," Mkhitaryan added.
"Sunday will be a big fight, a big battle, so we have to be ready for that."
(Reporting by Shravanth Vijayakumar in Bengaluru, editing by Ed Osmond)
