The League Managers Association has described Alan Pardew's actions during Newcastle United's win over Hull City as "inappropriate" and "unacceptable".
The Magpies manager headbutted Hull midfielder David Meyler during the 4-1 victory at the KC Stadium yesterday afternoon.
Chief executive of the LMA, Richard Bevan, told Sky Sports News: "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 [the apology].
"But Alan does need to think hard about how not to put himself in that position again. I was pleased to see Newcastle in a very short period of time making a very swift, professional response that provided Alan with a very heavy fine and a formal warning."
Pardew was fined £100,000 by the club and given a formal warning, but he could face further action from the Football Association.
