Birmingham defender Paul Robinson has been charged with violent conduct by the Football Association.The charge relates to an off-the-ball incident during the derby game against Aston Villa on Sunday in which Robinson clashed with James Chester in the immediate aftermath of Gabby Agbonlahor's winning goal.The Birmingham captain appeared to trip and then kick Chester, sending the Villa defender to the floor in an incident missed by the match officials at the time, but the FA have now acted after studying video footage.An FA statement read: ''Paul Robinson has been charged with alleged violent conduct following the Aston Villa versus Birmingham City game on Sunday.''The Blues defender was involved in an incident in or around the 68th minute which was not seen by the match officials at the time but caught on video. He has until 6pm on 26 April 2017 to reply to the charge.''Off the ball incidents which are not seen at the time by the match officials are referred to a panel of three former elite referees.''Each referee panel member will review the video footage independently of one another to determine whether they consider it a sending-off offence.''For retrospective action to be taken, and an FA charge to follow, the decision of the panel must be unanimous.''Should the charge be upheld, Robinson will be suspended for at least three matches, ruling him out of the rest of the season as Birmingham battle to remain in the Championship. The Blues host Huddersfield on Saturday before a potentially crucial final-day trip to Bristol City.Harry Redknapp was appointed as manager last week after Gianfranco Zola quit in the hope that he could keep the club in the division. The 1-0 defeat at Villa Park was his first game in charge and left Birmingham one place and two points above the relegation zone.