Cardiff have lost their appeal against Joe Ralls' red card at Tottenham.
Ralls was sent off by referee Mike Dean for a 58th-minute tackle on Lucas Moura in Saturday's 1-0 Premier League defeat at Wembley.
The Bluebirds challenged the red card, but their appeal has been rejected by the Football Association.
After the game, Cardiff manager Neil Warnock branded the decision as "very soft" and accused Spurs striker Harry Kane of "trying to make an issue of it" by squaring up to Ralls.
"You don't go off like that. He (Kane) is doing that to make an issue of it, to get the referee thinking (it was) worse than what it is," Warnock said.
"I don't think you should try to get other pros sent off, just because he's had a poor game and Spurs were having a poor game. He shouldn't take it out on us."
Ralls will now serve a three-game ban and miss matches against Fulham, Liverpool and Leicester.