Furious Amir Khan has vowed to knockout Gairy St Clair after hearing a radio ad recorded by the Commonwealth lightweight title challenger.

Cheeky St Clair warned Khan he was coming to destroy him in a radio advert for their February 2 fight at the ExCeL London, currently playing on Talk Sport.

The Australia-based Guyanan tackles Khan over 12 rounds - and has vowed to be firing until the final bell.

But the 21-year-old hot-shot from Bolton has vowed to make him eat his words.

" I was heading to my training camp listening to the radio, when I heard the advert," said Khan.

" I couldn't believe it!

" I was so mad that when I got to the gym I did double my normal routines just to get rid of the anger.

" I think Oliver Harrison's hands are still stinging from when he took me on the pads.

" I'm still pumped up about it now, and can't wait to show him who's boss a week on Saturday.

" St Clair has got a great record and he's been the distance with some quality fighters like Vivian Harris and Diego Corrales, but he won't go the distance with me.

" This is my chance to make a big statement by stopping St Clair for the first time, and also beating a former IBF world champion.

" I've also been reading that St Clair knocked around a big Australian heavyweight called Mad Mick. Well, he won't be able to do that to me"

Khan-St Clair heads a quality card at the ExCel Arena, with Michael Jennings' WBU welterweight title defence against Ross Minter also on the show.