Joseph Parker may have defeated Derek Chisora, but Tony Bellew believes he did not show enough to mount a challenge to become world champion again.
Parker once held the WBO belt, and so far this year has wins against Junior Fa and Chisora, the latter coming by split decision last Saturday.
Both Fa and Chisora are credible heavyweights, but Bellew told Sky Sports that he did not look like a title contender anymore.
"He's not a bad fighter, but no,” he said.
"I think his heavyweight champion days are long gone. I don't think he's the fighter that he was.
"Every dog has his day. Believe you me, I know that as well as anyone. I wish tomorrow I could come back myself, but I don't think he can reach those dizzy heights again now.
"I think he had his moment and as soon as the levels stepped up in competition, and the fitness level of the opponents that he's facing got better, it will show."
Bellew explained that Chisora’s impressive showing against Parker demonstrated some of Parker’s limitations.
"It's not like the Usyk fight where he's lost and it's been a hard fight," Bellew said.
"Tonight, it was in his hands and I thought he just done enough. I just thought it was one of those fights where he brings all the pressure.
"No doubt about it, Parker was the sharper of the two. He landed some really nice combinations, but Derek pressed the whole fight. He hurt him, more times than he hurt Derek.
"I just thought for me, Derek done enough. Don't get me wrong, it's not a big landslide victory. It's not a robbery by any stretch of the imagination, but Derek Chisora won that fight in my opinion."
Chisora said earlier this week that he would not countenance retirement, a decision Bellew endorsed.
"I know Derek will fight on. Derek likes to fight. He's born to fight,” he said.
"It's not about money, it's not about fame, Derek loves fighting."