The League Managers Association (LMA) has urged Liverpool boss Rafa Benitez and Manchester United manager Sir Alex Ferguson to "move on" from their rift.
Benitez refused to congratulate Ferguson on United winning the Premier League title in the pair's latest spat. "They are very experienced, very successful and highly competitive," said LMA chief executive Richard Bevan.
"They will at times have strong views but I think on this instant it is time for all parties to move on." And Bevan insisted the LMA takes an active role in making sure managers act responsibly.
"At the LMA the image of the game matters and we speak to all of our members on an ongoing basis on a variety of issues," he added. Benitez was cagey when asked about United's title win following his own side's 2-0 victory over West Brom.
"I prefer just to say well done to the club, a big club, a good club," he said. "Normally you have to be polite and respect the other manager but during the season we have seen a lot of things that I didn't like, so that's it. "I say congratulations to United because they have won. And that's it."
Benitez's comments added fuel to the ongoing feud between the two managers as they have traded blows while their teams have battled for the league crown.
In January Liverpool were top of the Premier League when Benitez unleashed a tirade regarding Ferguson's views on the Christmas fixture list, which came to be know in the tabloids as "Rafa's rant."
And in April, prior to United's FA Cup semi-final defeat against Everton, Ferguson blasted Benitez for labelling Everton as a "small club" and criticised the Spaniard for showing contempt to Blackburn when the Liverpool boss appeared to dismiss Sam Allardyce's side once Liverpool scored their second goal in a 4-0 win.
United's victory gave them a record-equalling 18 titles along with Liverpool.

BENITEZT ... cautious over £30m war chest
The Liverpool chief will get a war chest of around £30million to land the men he hopes can finally bring the Premier League crown to Anfield.
Any additional funds are going to have to come from flogging some of his current stars, including Ryan Babel, Andrea Dossena, Lucas and even Xabi Alonso.
Benitez said: “If we spend big on one player and he’s not successful, it’s worse for us than United. If they make one or two mistakes, because of the difference in money between us, they can spend £40-50m on players.
“If you have more money you can sign players with more quality, like United have.”
For all Rafa’s bleating, he has not been slow out of the blocks at spending himself — and not always with the right result.
Last summer, Robbie Keane arrived from Spurs for £20m but was then sold back to them for £12m in January.