Manchester United have issued a warning to fans over their behavior when Chelsea visit Old Trafford on Saturday amid fears that Alejandro Garnacho 's return to the club could be a catalyst for offensive chanting.

Garnacho, 21, is set for a hostile reception when he returns to United for the first time since his summer move to Stamford Bridge.

He was exiled by Ruben Amorim after criticizing the United head coach following the Europa League final defeat to Tottenham in May.

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United have issued guidance -- including publishing a statement from fan group Rainbow Devils -- before Chelsea fixtures in the past.

And the club has attempted to preempt any offensive chanting ahead of Gar

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