O'Shea told the Sunday Mirror: "I don't know about having a hairdryer, when the gaffer has a go it's more like a flamethrower!
"He wants to improve us as a team and himself as a manager - and he wants to do it now. It's obvious he wants to go right to the top. Like all good managers, he isn't afraid to let rip when he needs to.
"But he's a great bloke to work for. He expects nothing less than 100 per cent and, if you give him that, he gives you everything back in return.
"In a way he is easy to please. He wants everyone working as hard as they can and if he gets that he has a smile on his face.
"He's got high standards and expects the same from everyone around him. If he doesn't get that, then he lets you know.
"But the best managers are like that. They don't accept second best.
"His enthusiasm is infectious and he does like to have a laugh and a joke - but only when the time is right. Believe me, he is relentless when it comes to getting his ideas across."