Ex-Spurs striker Ferdinand, known to fans as Sir Les, was brought back to White Hart Lane as a coach.
Ferdinand told The Sun: "It's at half-time when a manager earns his corn. In Milan, I know there were people thinking this could be eight or maybe 10.
"Harry didn't steam into anyone but he still has to kick a few butts and he does it very much in his own way.
"I've seen half-time team talks where managers go off the handle and don't know what they're talking about. Tea cups and all that.
"Sure he was angry but it was in a constructive way. And there was no one who could have sat there and gone 'Oh, he's having a go at me'.
"No, he had a go at the team, because we'd under-performed. You're a pro footballer and you've got responsibility. And he made them aware of that responsibility.
"You know exactly who is the boss.
"People always questioned whether he could do it at a big club.
"The doubts have been there but he has proved beyond any doubt what he is capable of. He is proving himself at a club where he can spend big money.
"What Harry has been good at is that he has been able to manage the big personalities. He certainly gets the best out of people."