Ricky, who teamed up with David for a new Sky Living show this week where the 30-year-old gives The Office star some boxing tips, said: 'Haye is the most exiting British boxer of a generation. He's kept the speed of a cruiserweight with the punching power of any heavyweight around.'
The 50-year-old added to ShortList magazine: 'He's smart too. It will be a tough fight but he should outclass Klitschko. He'd better tell me which round so I can get to the bookies.'
Haye takes on Klitschko on Sky Box Office on Saturday at 8pm, with the winner taking away the WBA, WBO and IBF heavyweight belts.