Sunderland manager Gus Poyet has laid down the law with his squad, insisting he will not put up with any more poor discipline on the pitch.
The Black Cats successfully appealed Wes Brown's controversial dismissal at Stoke City at the weekend, but in recent weeks both Lee Cattermole and Andrea Dossena have seen red.
And Poyet insists that he will not put up with regular problems when it comes to players behaving on the pitch.
"When someone does something really, really stupid and it's repetitive, he doesn't have a chance with me," he told the Shields Gazette.
"They need to be professional."
Cattermole and Dossena are both available again for this weekend's trip to Aston Villa, having served their suspensions.
"I can assure you that they know what they've done. That's very important," Poyet said.
"They're not complaining about the referee. They know there is a limit, and they need to be careful.
"I hope it never happens again, but we'll see.
"There's a time for everything. We all make mistakes, and there is no explanation why you do it. It happens in a split second.
"But if you do it every week, you've got a problem."