He may be the up and coming star of boxing but former two-time heavyweight champion George Foreman has warned Anthony Joshua not to underestimate veteran Wladimir Klitschko.
IBF title holder Joshua, 27, and former linear champion Klitschko, 40, will step into the ring for their highly-anticipated showdown at Wembley on April 29.
Olympic gold medallist and Englishman Joshua (18-0) will put his title on the line against Ukraine's Klitschko (64-4), whose reign as champion came to a surprise end against Tyron Fury in November 2015.
With Joshua in the prime of his career and Klitschko nearing the end of his, and there is the belief that the former's youth gives him the advantage, however, Hall of Famer Foreman insists the latter should not be counted out.
"He [Joshua] is a good athlete. He can run and jump. He does a lot of things good. He makes for a good boxer," Foreman told Omnisport.
"I think he can be a good fighter and a champion but beware of veterans.
"Klitschko is a veteran. When you start counting people out that is when they reach deep down inside and get things you didn't know they had. I never count veterans out and they are there and can surprise you.
"But Joshua, he hasn't lost and probably doesn't know what he is fighting for yet. The best is yet to come from him but he has to be tried and tested like the rest of us."
Already more than 80,000 tickets have been sold for the blockbuster event in England, with Klitschko to be 41 at the time of the fight.
It remains to be see how long Klitschko will prolong his future for but Foreman would not be surprised if the 1996 gold medallist continued boxing.
"Boxing is so addictive. You win and you say it's the last one and the next you know, you're in the ring again," the 68-year-old said.
"You probably don't get out until you're knocked out of the ring like Bernard Hopkins."