Nicky Butt has left Man United to potentially join Celtic as Roy Keane’s number two, Football Insider has learned.

The Premier League giants announced on Wednesday that the United legend has quit the club’s academy after nine years for a “new professional challenge”.

A Celtic source has told Football Insider that Butt, 46, has been lined up to be Keane’s assistant manager as part of a big-name new management team.

This site revealed earlier on Thursday (25th March) the Scottish giants are in talks with Keane and are ready to offer him the post.

The latest situation is that the Irishman has not yet agreed terms with Celtic but is now believed to be the clear frontrunner for the vacant post.

His return to the club he supported as a boy and where he spent six months at the end of his playing career would send shockwaves through football.

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That is partly due to his combustible personality and football CV, as well as the fact he has been in the managerial wilderness for 10 years.

Nevertheless, Celtic believe Keane’s experience as assistant manager at the Republic of Ireland, Aston Villa and, most recently, Nottingham Forest are very relevant and show he is in touch with the modern game.

Famed ‘Class of 92’ graduate Butt would also offer a different skill-set, including key experience in working with and developing young players.

As well as nine years at United in coaching and development roles, Butt also spent 12 years playing for Britain’s biggest club.

Keane’s last managerial post ended in rancour at Ipswich Town in 2011, following a more impressive spell at Sunderland.

In other news, Kieran Maguire delivers verdict on Ibrox expansion as Rangers plot to rocket past Celtic revenues.