The FA has contacted Wayne Rooney in relation to comments he made about a match in 2006.
Rooney has revealed that he changed studs for a Manchester United clash with Chelsea 'to hurt someone'.
The game in question came towards the latter end of the season, with Chelsea requiring just a point to secure the Premier League title.
The London club - managed by Jose Mourinho - won the match 3-0.
However, Rooney's revelation in the Mail on Sunday ahead of the release of a documentary on his career on Amazon has led to concerns from the footballing authorities.
"I put longer studs in because I wanted to hurt someone," the Derby County boss said.
'If Chelsea won a point, they won the league. At that time, I couldn't take it.
'The studs were legal. They were a legal size. But they were bigger than what I would normally wear.'
"For that game I changed them to big, long metal ones - the maximum length you could have because I wanted to try and hurt someone, try and injure someone."
The admission from Rooney prompted a response from John Terry, who Rooney challenged on the day at Stamford Bridge.
🤣🤣 @WayneRooney is this when you left your stud in my foot? 🤣 https://t.co/sSJH7AwCTK
— John Terry (@JohnTerry26) February 7, 2022
"We knew if Chelsea won then they had won the league that day," Rooney says in the documentary.
"Until my last game for Derby, I always wore the old plastic studs with the metal tip.
"I left a hole in his foot and then I signed my shirt to him after the game", Rooney said.
"A few weeks later I sent it to him and asked for my stud back."
It remains to be seen what action - if any - will be taken by the FA in relation to the comments.