Manchester United took some of the shine off their Europa League victory, after a video emerged from their Stockholm dressing room on Wednesday night.
United beat Ajax 2-0 at the Friends Arena in comfortable fashion, thanks to goals from Paul Pogba and Henrikh Mkhitaryan.
Much of the lead up to the game had centred around a city united following Monday night’s terror attacks.
Indeed French star Pogba dedicated United’s win in Sweden to the 22 who had tragically lost their lives.
Manchester City posted their congratulations to their rivals on social media, while United players posed for a picture with a banner declaring “Manchester - A city united” after their victory.
However, another social media post soon emerged, with United’s team singing a celebratory song which included a disrespectful line about City.
The chant goes as follows: "U-N-I, T-E-D, United are the team for me, with a nick nack paddy wack give a dog a bone, why don't City f*** off home."
It was posted by Jesse Lingard but quickly removed from his Instagram account after a string backlash from disappointed supporters.
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The offensive song has long been a staple at United fixtures, sung by supporters to goad their rivals.
But after a week in which the people of Manchester had come together, in the wake of such grave tragedy, it leaves a sour taste.
United players have been criticised heavily on social media in the aftermath, with Lingard in particular being targeted.
"The respect Manchester City and the fans have shown MU and that is how you behave in the dressing room?! Disgrace! I'm embarrassed for you," wrote one fan.
Even United fans felt embarrassed for Lingard: "Wish Lingard would be careful with the things he posts on social media, no need to disrespect the city fans who shown their respects for us."
Lingard backtracked on his anti-City line when he posted a tweet insisting he was united with the club's rivals.
"Rivals on the pitch, united in tragedy manchester we did it for you," he said.
Jose Mourinho has looked to crackdown on players’ social media posts in recent months, with public posts immediately before and after games drawing his ire.