Fenerbahce boss Dick Advocaat has said Manchester United's Jose Mourinho is an unbelievable manager but "not a magician."
Advocaat is keen to capitalise on his counterpart's teething problems at United after Mourinho's arrival brought an injection of excitement at Old Trafford after three frustrating years under David Moyes and Louis van Gaal.
United started superbly but have only managed to impress in patches since their winning run ended, meaning they arrive in Turkey off the back of a frustrating goalless draw at home to Burnley.
"This man proved himself in all countries," the former Sunderland and Rangers boss said ahead of Thursday's Europa League meeting.