Roy Keane is “too old-school” and Celtic should not appoint him as their next manager, according to Gabriel Agbonlahor.

Speaking exclusively to Football Insider, the former Aston Villa captain lifted the lid on Keane’s methods from when the pair worked together at Villa Park and claimed he was “vicious” and “aggressive”.

Keane spent four months as the assistant manager at Villa under Paul Lambert in 2014 before resigning to focus on his role with the Republic of Ireland.

The Scottish Sun reported last week the ex-Hoops midfielder is keen on the vacant managerial job at Parkhead.

His former boss at the Republic of Ireland and Nottingham Forest Martin O’Neill will be consulted by the Celtic board before they appoint their new manager, as first revealed by Football Insider.

The 49-year-old has not managed since he was sacked as Ipswich Town boss over a decade ago.

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Asked whether Keane would be a good appointment, Agbonlahor told Football Insider correspondent Connor Whitley: “It’s hard.

“From my time with Roy Keane, he’s too old school to manage now.

“His ways at Aston Villa were very old school. Players were told viciously about how they perform. 

“If you don’t perform you’re getting told in a very aggressive way and players don’t really accept that anymore. Football’s changed.

“I just don’t see that happening to be honest. I don’t think that would be a wise appointment.”

Celtic

Keane ended his playing career at Celtic, making 10 appearances in a six-month spell.

As well an ill-fated period in charge of Ipswich, Keane won the Championship title with Sunderland in the 2006/07 season.

In other news, “phenomenal” Chris Wilder backed to land the Celtic job as talks begin with a 44-year-old.