Roy Keane has reignited his long-running feud with Sir Alex Ferguson and said he “wouldn’t forgive” his former manager.

Keane left Manchester United in 2005 and has since accused Ferguson of deserting him before his departure, and the Irishman has now questioned exactly how good of a man-manager Ferguson really was.

“I wouldn’t forgive Ferguson. The media spin, how I apparently upset everybody, it was all nonsense,” Keane told Off The Ball this week. “I think when he apologises I will probably say hello to him, yeah. [But] I’ve no interest in speaking to the man.

“People talk about Ferguson’s man-management. Don’t be kidded by all that. I was at the club when Bryan Robson left, when Steve Bruce left, two brilliant servants for Manchester United, and I didn’t like the way they were treated.”

Keane’s exit from Manchester United came by mutual consent after an extended spell on the sidelines due to injury. He retired from football just six months after joining his next club Celtic.

Roy Keane: The highs and lows Show all 19 1 /19 Roy Keane: The highs and lows Roy Keane: The highs and lows GETTY IMAGES Roy Keane: The highs and lows Roy Keane of Nottingham Forest jumps for the ball during a match against Manchester United at Wembley Stadium in London in 1992 GETTY IMAGES Roy Keane: The highs and lows Keane (left) in action for Ireland against Denmark in a World Cup Qualifying Match in 1992 GETTY IMAGES Roy Keane: The highs and lows Roy Keane of Manchester United coaches local children in Soweto during their tour to South Africa in 1993 GETTY IMAGES Roy Keane: The highs and lows Keane is brought down by Tepekule Yusef of Galatasary during a Champions League Match in 1994 in Istanbul, Turkey GETTY IMAGES Roy Keane: The highs and lows Roy Keane (left) and Peter Schmeichel of Manchester United hold the FA Charity Shield after victory against Chelsea at Wembley Stadium in 1997 GETTY IMAGES Roy Keane: The highs and lows Keane recieves the Carling player of the month during the FA Carling Premiership match against Newcastle United played at Old Trafford in 1998 GETTY IMAGES Roy Keane: The highs and lows Keane pictured in 1999 against Juventus in the Champions League semi-final second leg. Keane inspired United to come from behind to win the tie 4-3 on aggregate. United went on to lift the Champions League to crown their treble winning season in which they also won the league and the FA Cup Roy Keane: The highs and lows Keane lifts the league trophy in 1999 after United's game with Tottenham GETTY IMAGES Roy Keane: The highs and lows Keane wins the Football Writers Player of the Year Award in 2000 GETTY IMAGES Roy Keane: The highs and lows Keane is shown a red card and is sent off by referee David Ellery during a match between Manchester United and Manchester City in 2001 GETTY IMAGES Roy Keane: The highs and lows Ireland's Roy Keane remains silent as he is approached by media at Saipan international airport on his way home from the World Cup finals in 2002 after his spate with manager, Mick McCarthy REUTERS Roy Keane: The highs and lows Keane taking his dog for a walk in 2002 after leaving the World Cup following a spat with team manager Mick McCarthy REUTERS Roy Keane: The highs and lows Roy Keane kisses the league trophy after the FA Barclaycard Premiership match between Everton and Manchester United in 2003 GETTY IMAGES Roy Keane: The highs and lows Roy Keane at Trafford Magistrates Court in 2004 in Manchester, England. Keane faced charges of assult and criminal damage after a clash with a 16-year-old boy GETTY IMAGES Roy Keane: The highs and lows Roy Keane and manager Gordon Strachan attend a press conference to announce Keane's signing for Glasgow Celtic in 2005 GETTY IMAGES Roy Keane: The highs and lows Roy Keane leaves the pitch at the end of his testimonial match between Manchester United and Celtic at Old Trafford in 2006. Keane announced his retirement the same year GETTY IMAGES Roy Keane: The highs and lows Roy Keane meets Sunderland supporters outside the Stadium of Light, in 2006 on his first day in the job GETTY IMAGES Roy Keane: The highs and lows Roy Keane quit as manager of Sunderland after a poor start to the season last term GETTY IMAGES

While Keane’s time at Old Trafford was successful, winning nine major honours as captain, he has since been particularly critical of Ferguson.

Keane also suggested that Ferguson afforded undue opportunities to family members, including his son Darren, who earned a Premier League winner’s medal in 1993.

Roy Keane has accused Sir Alex Ferguson of deserting him (Getty)

“People said [Ferguson] always had the best interests of Manchester United at heart. Darren Ferguson [his son] won a medal. He was very lucky. [Alex Ferguson’s] brother was the chief scout for Manchester United for a long time. I’m surprised his wife wasn’t involved in the staff somewhere.