The Portuguese was often critical of Mkhitaryan after he moved to Old Trafford from Borussia Dortmund for £26million in 2016 and Petrosyan claims his player "had a problem" with United's manager.
YEOVIL Town will take centre stage on Friday evening as they play host to Manchester United in the fourth round of the Emirates FA Cup.
Mourinho added: "I am really honoured and proud to be Manchester United manager".
"We got one of the best attacking players in the world and he's very important for us because we ant the best possible players", Mourinho said. I would like to say a big thank you to the owners and to Mr Woodward for the recognition of my hard work and dedication.
"Now we have five attacking players of quality, (Juan) Mata, Rashford, (Romelu) Lukaku, Martial, Alexis and it's fantastic for me and for the team, if the players one day are on the bench and they don't like it, I'm happy with that".
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He's attracted a whole host of big-name players, including most recently Alexis Sanchez from Arsenal earlier this week, and improved the club's performances and results.
To have a player of global level, a reference player of Alexis' calibre right now in a great club is wonderful.
Henrikh Mkhitaryan has been tipped to play a key role in 2017/18, beginning tonight in Macedonia.
It's a great, satisfying night for us because we managed to beat a strong team and I felt that in January we paid a heavy price for uncertainty that was existing in our dressing room. "What we can not do is play 12 at the same time, start 12 in a certain match, but space for everybody and needed for everybody I think is absolutely fundamental".
'Could he perform better with us?
'That was one of the things that attracted me to come here, along with the manager, who is a person who won everything in Italy, the same as he did in Spain. We are going to rest a couple of players; we also have a couple of problems that we want to try to resolve, with problems for the next matches in February in the Premier League and also Champions League.