Manchester United midfielder Henrikh Mkhitaryan has told SFR Sport it is "hard to play" without the injured Paul Pogba.
France international Pogba suffered a hamstring injury in last week's Champions League win over Basel and will undergo further tests this week.
United had hoped to have him back in time for the clash with rivals Liverpool on Oct. 14, but could be without him for longer.
Although they beat Everton 4-0 in his absence on Sunday, Mkhitaryan said: "It's hard, because he's a top player for us.
"It's going to be very difficult, but the coach knows how to make up for that and we're going to help him come back stronger."
Mkhitaryan was among the scorers as United eventually overpowered Everton, for whom Wayne Rooney featured on his first return to Old Trafford.
Rooney, United's record scorer, received a standing ovation when he was substituted eight minutes from time, and Mkhitaryan said: "Rooney is a legend. He's an exceptional player. It's a shame that he's at Everton now.
"You saw the fans treated him as if he was one of their own. Good luck to him for the rest of the season.
"It was a very good match, a bit difficult, but happily we won."