(REUTERS) - The English Football Association (FA) has sought observations from Derby County manager Wayne Rooney after he said in a recent interview that as a player he wanted to injure an opponent during a game in 2006, British media reported.

Former Manchester United forward Rooney told the Mail On Sunday that he wore longer studs in a game against Chelsea at Stamford Bridge because he "wanted to hurt someone".

"I changed my studs before the game," Rooney said.

"I put longer studs in because I wanted to hurt someone."

"The studs were legal," he added.

"They were a legal size.

"But they were bigger than what I would normally wear."

Rooney and John Terry clashed during the game, with the Chelsea defender receiving treatment.

Terry responded on Twitter with laughing emojis and the question: "@WayneRooney is this when you left your stud in my foot?"

United lost the match 3-0, with Chelsea winning the league that season.

Rooney's former United teammate Roy Keane was fined and banned by the FA in 2002 after he admitted in his autobiography that he had intentionally set out to injure Manchester City midfielder Alf-Inge Haaland, father of Borussia Dortmund striker Erling Haaland, in an April 2001 match.