Wigan defender Fitz Hall will serve a three-match suspension with immediate effect after an appeal against his dismissal in the 1-1 draw at Watford on Wednesday was rejected.
Wigan were confident the straight red card issued by referee Rob Styles for a lunging tackle on Yohann Cavalli would be overturned.
But following a hearing today of the Football Association's four-man Disciplinary Commission, they have upheld Styles' decision.
It means the 26-year-old centre-back will not be available to play for Wigan for over a month, with a return likely for the crucial relegation showdown at Charlton on March 31.
Hall first misses Sunday's JJB Stadium clash against Newcastle, followed by the March 3 trip to Manchester City and the home game with Fulham a fortnight later.