Roy Keane will once again link up with Martin O'Neill to become Nottingham Forest assistant manager, the Sky Bet Championship club have announced.
The 47-year-old was part of O'Neill's backroom staff during their five-year spell in charge of the Republic of Ireland between 2013 and 2018.
Keane, like O'Neill, is a favourite at the City Ground after making over 100 appearances for the club between 1990 and 1993 before moving to Manchester United, where he went on to win seven Premier League titles.
It was widely expected that Keane would join as assistant to O'Neill, who became the club's 11th full-time boss since 2011 on January 15, and Forest confirmed his arrival on Monday.
A statement read: "Nottingham Forest are delighted to confirm that former Red Roy Keane has returned to the club as assistant manager.
"Keane, who started his professional football career with the Reds in 1990 and went on to make over 100 appearances in the Garibaldi, joins Martin O'Neill's backroom staff with immediate effect."
There had been rumours of Keane returning to management after he and O'Neill left their roles with Ireland in November.
The former Forest midfielder guided Sunderland back to the Premier League during his first season in charge at the Stadium of Light in 2006 before resigning in December 2008 and went on to manage Ipswich from 2009 to 2011.
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Republic of Ireland manager Martin O'Neill has admitted he could not ask any more of assistant Roy Keane.
O'Neill catapulted the nation firmly into the headlines when he invited the former Ireland and Manchester United captain, who 11 years earlier had left the World Cup squad in the Far East after a spectacular fall-out with then boss Mick McCarthy, to be his number two back in November 2013.
Four years on, the pair are battling to guide their team to the finals of a second successive major tournament, and the manager believes his decision has been fully justified.
He said: "Roy has been everything I expected of him when I chose him as the assistant manager. I didn't pretend to know him that well - we had worked together on some programmes before that.
"But he is everything that I expected of him and more besides, an inspirational figure on the field, as he was, a hero to a lot of players who are in the squad at this moment and a big figure, not just for Irish football, but for world football.
"All of those things, he has continued to bring and I couldn't ask any more of him."
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Roy Keane believes Jose Mourinho seems like a good fit for Man United even though he isn’t the Portuguese manager’s biggest fan.
The Old Trafford legend was asked for his thoughts on United’s new head coach during ITV’s Champions League highlights show on Saturday night.
“He was always going to be a good option when United didn’t qualify for the Champions League,” Keane said.
“Fantastic CV and seems like a good fit. Maybe not for me. He’s not my kind of cuppa tea. I find him really irritating when I’ve coached against him, but that’s just a personal thing."
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