Onana enjoyed his best performance in a Red Devils jersey so far during Tuesday's 1-0 Champions League win over Copenhagen, where Harry Maguire's header got Erik ten Hag's side off the mark in Group A.
However, Man United were forced to endure a heart-in-mouth moment in stoppage time, as Scott McTominay's high boot in the penalty area gifted the Danish champions the chance to draw level from 12 yards.
Jordan Larsson stepped up to the mark, but Onana dived to his left and stuck out a strong hand to turn the striker's effort behind, and he was immediately mobbed by his teammates before the final whistle sounded.
Following the Cameroonian's stoppage-time heroics, Garnacho posted a photo on X — formerly known as Twitter — of Red Devils players swarming Onana, accompanied by two gorilla emojis.
Garnacho's post — which has since been deleted — sparked huge controversy, and the FA are now understood to be investigating the use of the emojis and have asked for the South American's observations.
Garnacho could potentially be handed a fine or suspension if his post was deemed to have caused offence, as was the case when Bernardo Silva compared former Manchester City teammate Benjamin Mendy to a character on a brand of chocolates in 2019.
Both Silva and Mendy affirmed that the post was a joke between two friends — which the FA accepted — but the former was still fined £50,000 and banned for one match due to the content being «insulting by reference to race, colour and ethnic origin», which brought the game into «disrepute».
Following the furore surrounding
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