The Armenia ace moved to Arsenal in January in part of the deal that saw Alexis Sanchez move the other way.
Mkhitaryan struggled to gain Jose Mourinho’s trust at Old Trafford and he thinks it because the emphasis on defending from the front.
“Everyone knows Arsenal play offensive football, and I love to play offensive football,” he told Sky Sports.
“In Manchester we were playing offensive football too but not in every game, so it was quite different.
“I don’t want to blame anyone because every manager at every club has a different philosophy. Maybe I couldn’t fit perfectly in the Manchester football.
“Every player has to defend, it doesn’t matter if you are a striker, winger, attacking midfield, you have to defend, you cannot just defend with four or five players, the whole team must defend.
“I’m doing my efforts to help the team to defend, sometimes it can work, sometimes it doesn’t. But I always try to do my best for the team first of all, and then I’m thinking of myself.
“I’m not an ego player to think of myself first. Then when I get the ball I can create.”
Mkhitaryan has started OK at Arsenal but the team is struggling and were beaten 3-0 in the Carabao Cup final on Sunday.
They face City again tonight in a fixture that could heap even more pressure on Arsene Wenger.
And Mkhitaryan insists the players need to fight for the manager.
“It’s not the easiest time for the club, but we are here to help, do our best, and put Arsenal on the level that it was before,” he added.
“I know it’s not going to be easy, but we’re trying, and doing our best.
“It’s a pleasure to work with [Wenger].
“He knows a lot about football, he can give you good advice, and I’m very happy to be here.
“Of course it’s not very easy for him either, but we have to play for the club, play for him, because he is a big role model for this team, big person at this club, so we have to do our best to show we are ready to fight for him.”