Erik ten Hag says Fulham "should apologise" for a TikTok posted on their account that appears to mock Manchester United captain Bruno Fernandes.
The video shows the midfielder go down and clutch his leg before swiftly getting up again during United's 2-1 defeat to the Cottagers on Saturday.
The clip is dubbed with jaunty music and captioned: "So glad he's OK."
"I would say it is not right. Totally out of order and wrong. They should apologise for this," said Ten Hag.
In the video clip, which manager Ten Hag was told about in a media conference on Thursday but had not seen, Fernandes is seen coming into contact with Fulham midfielder Sasa Lukic and going to ground.