Arsenal forward Gervinho has had his three-game ban for violent conduct upheld by the Football Association after his appeal was dismissed.GettyImagesArsenal's £10.5 million debutant Gervinho is sent off following a tussle with Joey Barton• Toon, Arsenal charged by FAGervinho, a summer signing from Lille, was given a straight red card after slapping Newcastle midfielder Joey Barton during Saturday's goalless draw at St James' Park. Arsenal manager Arsene Wenger confirmed the club's intention to appeal the dismissal, but the Frenchman has seen the ban upheld, meaning Gervinho will miss the games against Liverpool, Manchester United and Swansea.A melee ensued following Gervinho's confrontation with Barton, and the FA subsequently charged both clubs with failing to control their players. Newcastle have revealed they will