Since the Belgian midfielder's £27.5 million move from Everton on transfer deadline day, he has failed to impose himself on the Red Devils' engine room but the Scot is unworried
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"He knows he can play better," Moyes told the press of Fellaini.
"When he came into the team, we were not playing as well as we would have hoped but, for a lot of people who join Manchester United, it doesn't always happen as quickly as you would like.
"He needed to take time but we threw him in very quickly.
"He also has a wrist injury that he will need an operation for and I think it's a little bit that he's protecting it but he will be fine for us - we just have to give him a chance."
Fellaini spent five years at Everton under Moyes before following him to Old Trafford.