Garath McCleary will serve a three-match ban after the Football Association dismissed Nottingham Forest's appeal against the red card he picked up at Peterborough.
The in-form winger, who was named the Championship Player of the Month for March, was given his marching orders during Forest's 1-0 victory at London Road on Monday.
A challenge on Posh skipper Grant McCann saw referee Carl Boyeson reaching for his pocket, and McCleary was sent for an early bath.
Forest boss Steve Cotterill felt the man in charge of proceedings was 'hasty' in his decision to order the 24-year-old from the field and said he would be 'amazed' if the decision was not overturned.
The Reds have, however, seen their efforts to have an impending suspension lifted come to nothing.
McCleary will now be forced to sit out fixtures against Blackpool, Reading and Hull City.
He will come back into contention for Forest's final game of the season against Portsmouth at the City Ground on 28th April.