Price, making waves in the division on the back of his own Olympic bronze medal achievement in 2008, shared training rounds with a young Joshua to give the amateur some experience and revealed a painful ending to their session.
“It’s probably the worst kept secret in boxing and it’s something that I’ve never really brought up or mentioned,” Price told Sky Sports News HQ.
“When it happened, Joshua was an amateur on the GB squad and I was a novice pro and I kept it to myself because he was an up and coming potential boxer. I wanted to protect him from it, didn’t want to go around boasting about it.
“But our positions have changed and he’s IBF heavyweight champion of the world. I’m someone who would definitely be interested in having a shot at it, and I thought the time was right to let the cat out of the bag and let people know.
“It is possible that Anthony Joshua can be hurt and can be beaten. What I’m talking about happened a long time ago, but it’s still the two same people.”
More specific on the nature of the KO, Price added: “If it was a fight, it would have been stopped immediately. Not asleep, but flat on his face and ushered out of the ring by his trainers.
“It doesn’t seem to affect him that much because he’s gone on to achieve good things. He won a world silver medal a few months later.
“Will he see my face and remember what happened when we were across the ring? Possibly. But there is only one way to find out,” he said.
Joshua returns to make a voluntary defence of his title in November or December of this year, whilst Price is pencilled in to continue his comeback on the Tony Bellew v BJ Flores WBC title undercard scheduled for October 15.