If his shouting is good enough to make Cristiano Ronaldo the player he is, we can't wait to see what he does with Jonny Walters.
There hasn't been much doubt over the past six years or so that Cristiano Ronaldo has been one of the best players in the world.
I mean, he's scored 326 goals in just 315 games for Real Madrid and he's won two Ballon d'Or's in the space of two years, so he's not doing too badly for himself.
And over the years, we've often wondered who was really to be credited for Ronaldo's excellent career; was it Alex Ferguson? Or Did Mourinho give him a hand?
Keane, who is now Martin O'Neill's assistant manager with the Republic of Ireland, told the Independent.ie all about his influence on Ronaldo: "I made him. If it wasn't for me, he wouldn't be where he is."
Now, we guess that he's having a great bit of craic, but who on earth can tell! He looks terrifying all the time and even got a bit chewy with the interviewer.
However, Ronaldo did recently claim that Roy Keane used to always shout at him, telling the Daily Mail: "[Keane was] always screaming to me: 'Cristiano! Pass the ball!'"
So maybe Roy is right after all! We reckon with all his shouting, Ireland might just qualify for the Euros and go on and win it!