Garnacho returned to United with Chelsea, though was left on the bench by manager Enzo Maresca.
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Old Trafford fans barracked the Chelsea loanee throughout United's 2-1 win and Garnacho didn't help matters when fans saw him blank Yoro and shoulder-check the United defender while they both warmed up.
Garnacho's behaviour only raised the decibels around the stadium as the boos rained down.
Watch below: