Keane was O'Neill's assistant with Ireland and at Nottingham Forest.
He told Go Radio: "Is Roy Keane managerial material? Absolutely.
"I have worked with him and know him on an assistant basis. He has got an opinion, he knows the game inside out and is a strong, strong character.
"The argument would be then 'does the modern player feel that he can be comfortable in those surroundings?'. That is a decision for other people to make.
"But absolutely [he can adapt] I think sometimes there is a feeling here that anybody of a certain age or certain vintage has the word dinosaur attached to them.
"Roy has his own methods, it is there when he does his punditry work you can see that is the case. And I think strong characters at a football club would like that sort of management."
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