Dick Advocaat believes Jose Mourinho will get it right at Manchester United once he works out his best team, but insists 'he's not a magician'.
The former Sunderland boss will try to add to Mourinho's problems when United face Fenerbahce in Istanbul on Thursday night.
United might have steadied their Europa League campaign following an opening Group A defeat to Feyenoord by beating Zorya Luhansk and then Fenerbahce 4-1 at Old Trafford a fortnight ago, but their last four Premier League games have brought one defeat and three draws.
Mourinho has also landed himself in trouble with the FA and faces two separate misconduct charges over comments made about referee Anthony Taylor before the trip to Liverpool last month and a half-time rant at Mark Clattenburg during Saturday's draw at home to Burnley.