Irish legends Liam Brady and John Giles are demanding Keane be axed by the FAI.
Reports emerged in yesterday's Sunday World alleging that Keane labelled Arter a 'p***'* and a 'w*****' for sitting out a training session on the advice of FAI medical staff.
Irish football heroes Brady and Giles - speaking on Eamon Dunphy's 'The Stand' podcast - insist Keane is not fit for the role of assistant manager.
"When you hear him speak about football in his punditry role, it comes across that he doesn't like modern-day footballers. I think this thing is boiling inside of him.
"He's damaging a squad that's weak in many ways anyway and we can't afford to lose any players.
"Every time there is an Irish game there was a story about Roy Keane, whether he was having a go at somebody or whether he was launching another book of his.
"It's crazy, it's mind-boggling and it's really taking the p***, isn't it? It really is taking the p*** out of the Irish soccer team.
"Martin O'Neill, or the powers that be, John Delaney, has to say enough of this. This has got to stop."
Leeds United legend Giles also said: "I knew there was a row. I didn't know what the details were.
"It shouldn't happen. Roy Keane is assistant manager of the Irish team and he is there to assist the manager.
"As assistant manager he should be helping Martin and in the Arter case he hasn't helped him at all. In fact, Arter has said he doesn't want to play, That's being destructive.
"If you talk about being equipped to be an assistant manager? Definitely not."