Anthony Joshua must learn from his defeat to Oleksandr Usyk if he is to come back stronger and keep alive the possibility of facing Tyson Fury, according to Joseph Parker.
Joshua lost his IBF, WBA and WBO titles to Usyk on Saturday after being outclassed by the Ukrainian on home soil at a packed Tottenham Hotspur Stadium.
The 31-year-old had no answer to former undisputed cruiserweight champion Usyk and lost on a unanimous points decision.
It was just the second defeat of Joshua's professional career, having previously been stopped by Andy Ruiz Jr. in June 2019 before reclaiming the belts in their rematch.
The prospect of Joshua and Fury facing off now appears slim, with the latter's promoter Frank Warren casting doubt on a bout that at one point looked certain to take place this year.
A rematch with 19-0 Usyk may now be on the cards for Joshua before he can contemplate facing Fury, who has a third clash with Deontay Wilder coming up on October 9.
But Parker, who was the first man to take Joshua the distance in their 2018 unification fight in Cardiff, believes there is still hope of an all-British heavyweight clash taking place.
"I feel like the point is just the best fighting the best," Parker told Stats Perform. "Even though AJ lost that fight to Usyk, he's still considered one of the best.
"He's going to go down in history as one of the best heavyweights. I think people want to see the best fight the best and that's a fight that can still happen.
"People will still be very interested to see who's the best British heavyweight there is."
Keep positive even if the world’s crumbling in front of you! London I love you & thank you each and every time! pic.twitter.com/GBgF7e5hcm— Anthony Joshua (@anthonyjoshua) September 25, 2021
Speaking after his surprise defeat in London at the weekend, Joshua said he is "110 per cent" up for a rematch with Usyk to win back his belts.
Despite the manner of the defeat, Parker has backed Joshua to put up a far stronger performance if he does step back into the ring with Usyk.
"I was a little surprised by the defeat," Parker said. "I mean, a lot of other people called it a 50-50 fight, a lot of people said it was going to be a tear up for AJ to win.
"But Usyk showed everyone watching tremendous skill and footwork and movement. You just saw him outbox and outsmart AJ for the 12 rounds.
"But [Joshua's] a smart man and he's got a smart team. He's faced a loss and adversity and he's come back with a better game plan. That's what he's going to need to do.
"I think I saw an interview saying he's already watched the fight straight after it happened and he just needs to make those adjustments and how to counter someone like Usyk.
"Who wins the rematch depends on the training, it depends on who shows up on the day. But going into the rematch, Usyk would have big confidence.
"It's pretty crazy how he came from the cruiserweight division, unified champion of the world and then has three fights and he's the unified champion of the world.
"That's the goal of a lot of heavyweights, is to be champion of the world and be unified champ. It's so crazy how things happen."
Congrats to Usyk. Now I want my shot. I wont let him breathe. #THEJUGGERNAUT— Joe Joyce (@JoeJoyceBoxing) September 25, 2021
Joshua followed up his victory over Parker, which saw him retain his WBA, IBF and IBO belts and win the WBO title, with a knockout triumph over Alexander Povetkin.
The Briton has lost two of his following four fights, however, giving him a record of 24-2 and leading to inevitable suggestions that his career is now declining.
But Parker said: "It's hard to say if that's the case. From when I fought him, he's had a couple of wins, a loss to Ruiz and come back and beat him again.
"He's saying that he's improving and getting better, but maybe he just was faced with a fighter who was just different, you know, in his element.
"When you see Usyk, with the footwork and the movement - he didn't really allow AJ to land his shots and catch him. He was just in and out and just very smart."