Erik ten Hag wants a public apology from Fulham after posting a video on TikTok appearing to mock Bruno Fernandes.
Football clubs are becoming more and more active on TikTok to cash in on the short video platform's popularity.
Fulham have posted a few clips already on their account following their 2-1 win over Manchester United at the weekend.
But the Red Devils are angry at a short clip of Fernandes rolling around on the floor after a tackle from Sasa Lukic before the midfielder quickly got back to his feet.
Erik ten Hag wants an apology from Fulham
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The video was dubbed with comedic music and was captained, "So glad he's ok..."
Ten Hag was asked about the social media post in his pre-match press conference ahead of United's clash with rivals Manchester City and he demanded an apology from Fulham.
"I didn't know this but if they did it, I would say it is not right," he said.
"It is absolutely not right that a clip makes such statements.
"It is totally out of order and they were wrong so they should apologise for this."
The video has more than half a million views and still remains up on Fulham's TikTok page.
Ten Hag went on to defend his club captain and rejected the notion he was guilty of simulation.
“I thought on Saturday it was definitely a foul, and it was really misjudged from the media and social media, to blame him for that," he said.
“Then opponents are targeting him. Then the referee should protect him because they were false on him.
@fulhamfc So glad he’s ok… 🙄 #fulhamfc #premierleague #brunofernandes ♬ sonido original - ♫ ♪ 𝒴𝒶𝓃𝒿𝓊𝓁𝓂𝒶𝓇𝓉 ♫ ♪
"And even after the ball was kicked away.”
Ten Hag added: “He (Fernandes) is a very passionate football player, very creative, he is creating the most chances in the Premier League, and you see opponents are targeting him, especially on Saturday after he’d had the knock.
“Then I feel the referee should protect him there. They had the chance already at the start of the game because it was so obvious they were looking for it.”
Bruno Fernandes got back up soon after the challenge
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Ten Hag also claimed the Portugal international picked up a "serious injury" against Fulham but continued playing.
He was back in action on Wednesday to help United defeat Nottingham Forest in the fifth round of the FA Cup.
And the midfielder was on the receiving end of some tough challenges with Felipe at one stage grabbing him by the throat.