West Brom manager Steve Clarke slammed defender Goran Popov after he was sent off for spitting in their 1-0 loss to Tottenham Hotspur on Sunday.
Popov exchanged angry words with Spurs defender Kyle Walker and Clarke admits that he was "absolutely disgusted" with his player.
Gareth Bale went on to bang in the winner for Spurs on the day, and Clarke believes that the sending off changed the entire game.
"The game changed with the sending-off. I'm absolutely disgusted with Goran's behaviour," said Clarke.
"One of the group has let the players down. It changed the whole complexion of the game.
"It's difficult enough in the Premier League playing against 11 players, especially when you're playing against Tottenham.
"There's no excuse for that. There's no place for it in life, never mind on a football pitch.
"I would like to think that at some stage he will apologise. As always there will be disciplinary procedures taken against the player but they'll remain in-house."