The fan who attacked Aston Villa midfielder Jack Grealish at Sunday's derby against Birmingham has pleaded guilty to assault and invading the pitch.

Paul Mitchell, 27, of Rubery was arrested and charged after entering the field of play in the early stages of the game at St Andrew's and hitting Grealish around the back of the head and neck.

Mitchell pleaded guilty on both counts and sentence will be passed on Monday afternoon.

His solicitor told Birmingham Magistrates' Court: "He cannot explain what came over him yesterday morning. His initial foolish intention was to just go on to the pitch and whip up the crowd."

Prosecutor Jonathan Purser told the court Grealish felt lasting pain after the incident but had suffered no substantial injury from a punch to the right side of his jaw.