Keane made a name for himself with his hard-man persona during his playing days, which saw him win countless accolades and captain Manchester United under Sir Alex Ferguson.
Since his retirement, he has dabbled in both coaching and punditry, and is currently known for telling it how he sees it on Sky Sports' Premier League coverage and on ITV.
The United legend, however, is believed to be portraying himself as a 'tough' man who isn't quite as hard as he thinks he is.
That's according to former Premier League manager Harry Redknapp, who appears to have challenged Keane to a fight.
Harry Redknapp (pictured), however, has insisted that Keane isn't 'as tough as he makes out'
'I don't think Roy Keane's as tough as he makes out,' Redknapp told Soccer PM. 'It's all bravado.
Redknapp, who took charge of the likes of West Ham, Portsmouth and Tottenham during his time as a top flight boss, is now 73 and hasn't managed in football since a brief role with Birmingham in 2017.
Keane, meanwhile, is 53 - 20 years Redknapp's junior - and was last involved with coaching when assistant manager of Nottingham Forest in 2019.
The duo crossed paths in the dugout on a number of occasions, notably when Keane managed Sunderland between 2006 and 2008, when Redknapp was in charge at Portsmouth.
But they could now be set to face off in a boxing ring or perhaps an octagon, if Keane is to respond to Redknapp's challenge.
Keane picked up 13 red cards during his playing career and was involved in a number of scuffles, while Redknapp was only sent packing once during his playing days.
Another hard man, however, Scott Brown, insisted that Keane's off-pitch persona is completely different to how he acts on-field.
'You can be whoever you want to be on a football pitch but you need to make sure you are a winner,' he said, via The Sun. 'You can be the most hated guy in the world; or the nicest guy in the world.
'Look at Jamie Redknapp, the nicest man in football. And then you look at Keane, probably a horrible man when he played. I never played against him but I can imagine he was horrible.
'Then you go and meet both and Jamie is a lovely man and so is Roy so there is no right way or wrong way.'