Speaking to Poker Strategy, the ex-Manchester United coach said: "I’m not surprised by Tom Brady’s comments about Wayne Rooney; I think they were said in a very ‘American’ tone.
"Brady is a sports personality himself and is hugely successful – he has certain expectations and standards he wants to uphold, but I coached Wayne when he was at Manchester United and he was always a keen trainer, hard worker and gave it his all.
"It’s hard to comment on the topic as I don’t know what’s happened behind the scenes at Birmingham City. I couldn’t see Wayne turning up late every day as the manager, but I don’t think he’s that type of person – that would be my assessment based on my experience with him.
"Wayne knows what his responsibilities are as a player and manager. It’s been difficult for him as a manager, since Derby, then heading to a completely different environment in the MLS, followed by his stint Birmingham, but I find it hard to believe his work ethic was sub-par."