Keane has let it be known he is eager to succeed Neil Lennon as Celtic manager, as he looks to revive a management career that has stalled for more than a decade following his exit as Ipswich Town boss.
"I have always got on great with Roy. He is a funny guy, a genuine person and has always been great company as a team-mate and in the years since we both stopped playing.
"I think the Roy Keane we see on Sky Sports is very much a guy who has created a TV identity and he lives up to it with his comments, but don't kid yourself and think Roy is like that all the time.
"If Roy gets the Celtic job, he would go into the club and shake a few things up, which is what they need given what we have seen with that team this year.
"But I also feel he will have learned from what has happened in his management career so far, as shouting and screaming at modern day players just doesn't work.
"If he is allowed to get the right players in at a club he clearly loves, I'm sure the Celtic fans would warm to having him as their manager."
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