The Armenian midfielder has failed to impress Jose Mourinho at Old Trafford and has not started for his club since aggravating a thigh injury in the defeat to Manchester City in September.
Mkhitaryan, who played in the whole of his country's dramatic World Cup qualifying win over Montenegro in Yerevan on Friday, says he will not give up his quest to impress his new boss.
In an interview on the Football Federation of Armenia's official website, Mkhitaryan said: "I know I can succeed at Manchester United, and I want to show everyone that I deserve to be a key player in this team and this league.
"Today I don't have enough playing time, so I have to do my best so the coaching staff give me the chance to play.
"There are no disappointments, just challenges
I never give up when I encounter obstacles in my way
I just continue going until I reach my career objectives."
The 27-year-old was a £27.3million buy from the Bundesliga club in the summer but has been sidelined by Mourinho, who has repeatedly stated he needs time to adapt in the Premier League
But despite the apparently difficult relationship between the pair, Mkhitaryan went on to hail Mourinho's "fantastic record" as a coach
He added: "Regarding Jose Mourinho, I hope I can learn a lot from him - he is a coach with a fantastic record
"I saw the move to Manchester United as an opportunity to grow as a player and as a person
"It was definitely not the salary that made me join Manchester United, I went for football reasons - for the history of the club, the fans and the coach because he is one of the best in the world
" The EPL is the best league in the world and it gives me something different, a new challenge
I think I can become stronger by playing there."
Source : PA
Source: PA