"You have to look after players but they lose touch with reality. You get people doing everything for you, it's sad. I was the same at (Manchester) United. The club book your car insurance, travelling, organise mortgages, whatever. There is that dependency.
"There is always a queue of lads outside my office. It's a bad habit to get into. Who was the last player to use public transport? You go first-class whichever way you go. I'm not having a go because they have the right to spend your money any way they like."
Despite his concerns, Keane is confident he has the right blend of characters - and the right club - to prevent it infecting the Black Cats.
"I'm bloody delighted with the lads I have here," he said. "I don't think Sunderland is the type of club that can create too many egos. There's not too many bright lights or magazine shoots, this is a workmanlike club."