Anthony Joshua has been tipped for the top by the best in the business.

World heavyweight champion Wladimir Klitschko says Watford’s London 2012 golden boy is the most promising fighter he has seen in ‘25 years’.

Joshua, 25, is undefeated in 13 fights since turning professional after striking gold at the Olympics.

WBA, IBF and WBO champion Klitschko, who has trained with the up and coming fighting, said: "Joshua has the qualities that not many guys have had. He definitely has the potential to become a real big star in boxing."

Klitschko, says he has been impressed by Joshua's all-around attitude as well as his performances in the ring.

He told BBC Radio 5 Live: “Anthony has all the tools to become that great champion inside and, most importantly, probably, outside of the ring.”