Manchester City defender Michael Ball has apologised for a challenge on Cristiano Ronaldo that has landed him a Football Association misconduct charge.
Television replays showed Ball to have stamped on the Reds winger during the 1-0 United win at the City of Manchester Stadium on Saturday.
The FA charged the Blues full-back with violent conduct, and Ball has now admitted to the incident.
"I deeply regret what I did and have accepted the charge without hesitation. I have also sent a personal apology to Cristiano," he told City's website.
"My action should not be seen on a football pitch and I know we have a responsibility at Premier League level to set a good example to the whole football community."
The 27-year-old is set to be banned for three games following a hearing on Thursday.