The former English midfielder has coached eight teams in his career but says he didn’t like the job.
Harry Redknapp managed Tottenham Hotspur from 2008 to 2012.
And while there, he says he became miserable, and couldn’t sleep even when the team won.
“You become a miserable rotter when you become a football manager, you forget how to laugh,” he told The Mirror.
“When you got to beat it was like a death in the family. I couldn’t face talking to anybody.”
“Saturday night I didn’t sleep a wink – I’d be buzzing when we won and when we lost I’d be fighting with the pillow all night,” he added.
Redknapp played professionally from 1965 to 1982.
And in 1983 he became manager for the first time, coaching AFC Bournemouth.
He coached seven teams after that: West Ham United, Portsmouth, Southampton, Tottenham, Queens Park Rangers, Jordan national team, and Birmingham City.
As a manager, he won the UEFA Intertoto Cup with the Hammers and the FA Cup with Portsmouth.
He was also the runner-up of the Football League Cup with the Spurs and made it to the EFL Championship Playoffs with QPR.