Simon Grayson has described Preston North End duo Eoin Doyle and Jermaine Beckford as an "absolute embarrassment" after they were sent off for fighting in a Championship game.
The two strikers squared up near the end of Preston's 2-1 loss at Sheffield Wednesday on Saturday as they chased an equaliser, and both are likely to receive three-match bans for violent conduct.
"I've been in the game for 30 years playing and managing and I've never been involved with anything like that," Grayson told BBC Sport.
"I spoke to them in the dressing room and they were apologetic, but that doesn't wash with me, something like that should never happen in the professional game."
"It's an absolute embarrassment. I stick up for my players at every club I've been at, I don't like to criticise them in public, I will do in the dressing room. But I can't stick up for either of those players.
"You expect it in the playground between four or five-year-olds, not from two professionals who've been in the game a long time.
"They've let themselves down, but that's the least of it.
"They've let our supporters down who've travelled here, and ultimately cost us the potential of getting a point or maybe three points because 11 against 10 we were on top and we had them.
"For something like that to happen is embarrassing. It's a joke, it's a disgrace."
The clash had echoes of the fight between Lee Bowyer and Kieron Dyer in a Premier League game featuring Newcastle United in 2005, and both men at the time were also dismissed.