“Everyone thinks the managers are in there [the changing rooms] doing the set pieces and warm-ups.
“But me and Fergie would be betting on the 2.45.”
Redknapp, who guided Portsmouth to FA Cup success in 2008, revealed a hilarious exchange they would have.
He added: “I’d say ‘Alex the players are going out,’ before he would respond ‘don’t worry about that’.
“It was alright for him though, he had a fantastic team.