ROY KEANE has been branded a bully by Sir Rod Stewart following his recent on-screen row with Jamie Carragher on Sky Sports.

The former Celtic midfielder was involved in a raucous argument with the ex-Liverpool ace surrounding the signing of Ronaldo at Manchester United this summer.

The debate quickly turned into a heated shouting match between the pair in the wake of United's 1-1 draw with Chelsea at Stamford Bridge.

Lifelong Celtic fan Sir Rod has hit out at Keane for being 'far too aggressive' in making his point. 

He told talkSPORT: "I think Roy can be a bit of a bully sometimes. I admired him as a player but he's a bit of a bully.

"I think there's a way of speaking your mind and (then) there's a way of speaking your mind and he's far too aggressive. 

"He was an elite player but do you think he could be a good manager with that approach?"

Keane played 13 games for Celtic in the 2005-06 season before hanging up his boots. He has not been involved in management for a decade after stints with Sunderland and Ipswich. He also enjoyed assistant roles at the Republic of Ireland, Aston Villa and Nottingham Forest.

The 50-year-old pundit reminded supporters of his time in coaching on Sunday as he responded to talk of him potentially taking over as interim coach of former club Manchester United. 

Keane said: "They (United) were never going to call me. That was never going to happen. 

"I'd have no problem going into the dressing room and getting control of any dressing room. I've managed in the Premier League, I don't think that would have been a problem to me. 

"People tend to forget that I have managed before and that I did OK in the Premier League with Sunderland."