The Portuguese heaped praise on the Belgium international, who attracted severe criticism from United fans last season, for his performance in the 3-1 win over Bournemouth.
He said: "Bailly and Daley played well, the midfield players had an unbelievable complement for each other.
"With Fellaini I always have the feeling that he was not loved by the general Red people.
"But if he plays like he's playing now, they have to love him because he's being so important for us."
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