League Managers Association chief Richard Bevan has condemned Newcastle United boss Alan Pardew over Saturday's behaviour.
Pardew headbutted Hull City midfielder David Meyler to be sent off during Newcastle's victory.
Bevan told BBC Radio Five Live's Sportsweek programme: "The buck stops with Alan. It's unacceptable, it's inappropriate and it's insupportable from every perspective and Alan knows that.
"He immediately realised the serious error, (made) sincere apologies to all parties and obviously (has) deep regret.
"It was good to see (Hull boss) Steve Bruce's reaction and Hull accepting (Pardew's apology).
"But Alan does need to think hard about how not to put himself in that position again."
