Pardew has been fined £100,000 by Newcastle and issued with a formal warning following his clash with Hull City's David Meyler.
The Magpies manager was involved in an astonishing incident on the touchline during the 4-1 victory at the KC Stadium when he appeared to attempt to headbutt the Tigers midfielder.
Newcastle legend Alan Shearer said it would be 'very difficult' for Pardew to keep his job at St James' Park but it is understood no further internal disciplinary action will be taken.
Referee Kevin Friend sent Pardew to the stands and booked Meyler, with the Newcastle boss issuing an immediate apology after the match.
However, that did not prevent the Premier League club from taking swift disciplinary action, while the FA have also pledged to investigate the incident.
A statement on the club's official website on Saturday evening read: "Newcastle United are disappointed with the actions of its manager Alan Pardew this afternoon.
"His behaviour was unacceptable and is not the behaviour we expect from the manager of Newcastle United.
"It is most disappointing that this incident has taken the focus away from what was a fantastic performance by the team and an excellent result away from home which leaves the club in eighth place in the Barclays Premier League.
"Sadly, the headlines tomorrow will not be focused on the result or the efforts of the players, but instead on the actions of our manager.
"Alan unreservedly apologised immediately following the game to the player, to Hull City Football Club and its fans, and to the fans of Newcastle United.
"We have held discussions this evening with Alan who has offered his sincere apologies to the club and it is clear he deeply regrets his actions.
"Alan has accepted a formal warning from the club in relation to his behaviour today and also a club fine of £100,000.
"The club is now drawing a line under this matter and will be making no further comment."
Football Association chairman Greg Dyke confirming to Sky Sports News earlier on Saturday evening that the governing body will look into the unprecedented clash.
Dyke told Sky Sports: "Clearly it looks serious and we will investigate it, but I can't really say anything else at this stage."
Pardew was recently reminded of his responsibilities by the FA following a foul-mouthed tirade towards Manchester City boss Manuel Pellegrini at St James' Park.
And it appears the latest incident will see him facing further disciplinary action from the authorities, although he attempted to quell the furore with an immediate apology and explanation.
Pardew told Sky Sports after the match: "It was just a heat of the moment thing. Obviously I massively regret it.
"I didn't mean to do anything aggressive, but I did move my head forward and that's enough.
"He was right on top of me and I wanted to just ease him away from me but obviously I put my head in a forward motion.
"I want to apologise to him, everyone at Hull and obviously my own fans as well.
"I don't think it was a headbutt. It wasn't a motion that was quick.
"Of course, I'm not stupid enough to accept there's going to be no punishment. I'll have to accept whatever comes my way.
"I believe my behaviour over the years has not resulted in too many fines and sitting in the stands, but this one probably will."