José Mourinho admitted said he is not happy with how Henrikh Mkhitaryan has been performing over the last five games.
However, the Armenian midfielder is set to return to the first-team at Manchester United so that his Portuguese manager can properly assess if Mkhitaryan has improved over the last few weeks.
"I was not happy with his last performances,' Mourinho said, as reported by the Daily Mail. "I'm not speaking about one or two, I'm speaking about three, four or five. He started the season very well and after that, step by step, he was disappearing.
"His performance levels in terms of goal scoring and assists, high pressing, recovering the ball high up the pitch, bringing the team with him as a No 10, were decreasing."
Despite Mourinho being keen to bring Mkhitaryan back into the Manchester United first-team, the 54-year-old still doesn't know if he'll start the former Borussia Dortmund playmaker in the Premier League match with Brighton on Saturday.
"I still have one training session but, for sure, he will be back in the group," the United boss added. "For him to be back to the group, it means that somebody is going to leave the group. That's life. When you have a chance and the performance is not what you expect, that's normal. You have to perform.
"I cannot say that training is the best habitat to analyse the players. I would say on the pitch, sometimes in a couple of minutes you see things."