But, far from stop there, the former Manchester United captain has gone quite a few steps further, branding Mourinho 'disgraceful' and claiming that the Chelsea boss could 'get punched' for some of his behaviour.
“[I didn't shake his hand] because the game is still going on," Keane told reporters at the launch of his new autobiography 'The Second Half.'
“I don’t mind all that but the game is still going on. It’s disgraceful, I’ve seen him doing it to other managers, it’s a disgrace.
“The game is still going on. You wouldn’t do that on a Sunday morning, you would get knocked out.
“I’m not sure that I’d have liked playing for him. He plays too many games with the media.
"I understand the need for games but there comes a point when you think, ‘Don’t play mind games today’. And poking the Barcelona coach in the eye - I wouldn’t have done that.
“If I was still a player today, I’d like to think I could work with Pep Guardiola. I like his style, and his presence, and the way he conducts himself.”