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Keano, who scored 33 goals in 326 appearances for the Red Devils said: “David Moyes brought in Phil Neville and everybody said it is great to have Phil Neville.

“I would like to ask, ‘What did Phil bring to the party?’

“And when David Moyes left, why didn’t Phil leave with him? Because David brought him in with him. So, interesting.”

Keane, now working as Republic of Ireland assistant-boss under Martin O’Neill, questioned why Phil Neville remained at Old Trafford after former Everton chief Moyes’ saw his six-year contract terminated in early May after a dismal season to forget for United.

Keane said: “Should Phil have walked with him?

“I don’t know, you would have to ask Phil but I know what I would have done. But we are all different.”

In fact, Neville became part of the dug out team comprising Class of ’92 stars Nicky Butt, interim manager Ryan Giggs and Paul Scholes.

Those four, plus Sky pundit Gary Neville and David Beckham formed the nucleus of the side that, under Keane’s captaincy, marched to the unforgettable Treble of 1999.

But straight-talking Keane, a regular fixture on ITV football programmes alongside Adrian Chiles, was never won over by the right dynamics for the staff.”