In an interview with 'BBC Radio Solent', Redknapp was invited to mark the 10th anniversary of his first and only trophy win, when he guided Portsmouth to a 1-0 victory over Cardiff City in the FA Cup final 2008.
The former Spurs boss said: ''I could still do it. I still feel as good as ever and I wouldn't have a problem doing it. Given the opportunity to go in and build a team, I know I'd do well.''
After being sacked by Birmingham, Redknapp stated at the time that there was ''every chance'' he would never return to a managerial role.
He also spoke to defend his record with The Blues: ''I wasn't going to go back but I went in at Birmingham when I got a phone call with three games to go. They'd won one in 25 but I took the chance, took the job, won two games and kept them up.''
Redknapp concluded: ''I came back this year, brought some players in on transfer deadline week and before I'd been given the chance to give them a game, seven games into the season I was gone. It was a crazy situation.''