​Roy Keane has reignited his long-standing feud with Sir Alex Ferguson by accusing his former Manchester United manager of nepotism, and insisted he would never forgive the Scotsman for the way he was portrayed.

The former Republic of Ireland assistant manager played under Ferguson for 13 Premier League seasons, but the pair have not seen eye-to-eye after Keane's acrimonious exit from Old Trafford back in 2005.

Since then, the duo have both been critical of one another. Ferguson has insisted the former ​United midfielder lacked loyalty, and questioned his negative influence in the dressing room. Such claims have naturally been met with rebuttal by Keane, although the latest addition to the spat has come during an Off the Ball podcast.

Via the ​Independent, Keane confirmed he would never forgive the legendary manager for deserting him since his infamous departure from the club, and also questioning his management credentials: “I wouldn’t forgive Ferguson. The media spin, how I apparently upset everybody, it was all nonsense,” he said.

“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 even had time to accuse the 13-time ​Premier League winner of nepotism, stating his son, Darren, was offered unfair opportunities.

Alex Ferguson and Roy Keane

“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," he added.

“Darren was [the manager] at Preston North End and lost his job. He had a couple of young players on loan from Manchester United, [but] guess what happens the next day? They’re pulled out of Preston. Is that doing the best for Manchester United? Do me a favour.”