David Moyes has backed Marouane Fellaini to return to his top form when Everton host Wigan on Sunday.
The Belgian midfielder was one of the Toffees' stand-out performers in the first half of the campaign following his club record £15million move from Standard Liege, but has struggled to hit such peaks since the turn of the year.
Fellaini is set to play for his country in midweek as they face Bosnia and Moyes is confident that a spell away from Merseyside will help rejuvenate his batteries for the season's final furlong.
"What he has done for us is affect things in both boxes and up until January, he was probably one of our best players, along with Phil Jagielka," Moyes told the club's official website.
"But since then, he has found things difficult. That said, he is still doing a good job for us. He is a good worker and he wants to listen. He will get better with time.
"We brought him in at the start of the season because we needed a bit of stature.
"We knew when we got him that there was scope for him to develop."
Moyes believes Fellaini has already reached a level that matches his initial expectation for what is always a difficult first season in English football.
"Your first season in the Premier League is always difficult and it was never going to be any different for Felli."