Marlon King appeared in court on Wednesday charged with attacking a woman in a nightclub.
King, 28, of Waltham Cross, Hertfordshire, appeared at City of Westminster Magistrates' Court in London.
The centre forward, who is on loan to Middlesbrough from Wigan Athletic, is alleged to have sexually assaulted and punched a 20-year-old woman in a central London club.
He is charged with sexual assault by touching and assault occasioning actual bodily harm.
King was arrested last December following the alleged incident at the Soho Revue bar in Brewer Street.
Dressed in a smart charcoal-coloured suit and grey shirt, King spoke only to confirm his name during the short hearing.
The case was adjourned to London's Southwark Crown Court on 14th May.
King was granted bail until that date.