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And fortunately for fans, a photographer was on hand to capture the precise moment his face was contorted into an expression reminiscent of those made by team-mate Phil Jones.
Fellaini clearly saw the funny side as he took to Twitter to share the image, writing: 'thank you to everyone who posted and sent me this' with a stream of 'laughter' emoticons.
The 29-year-old, who picked up another knock later in the game but carried on, helped his team to mount somewhat of a fightback in the second half and received praise from manager Jose Mourinho.
'The group is fantastic and Marouane is just an example of that group, of that spirit we have,' the Portuguese said after the game.
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'We were losing 2-0 against a fantastic team and, after 2-0, the next ball is a double chance with an open goal. Amazing reaction, and then we got to 2-1.