Anthony Joshua urged Dillian Whyte to prove his stunning defeat to Alexander Povetkin was just "a blip", as Tyson Fury waded in on a remarkable heavyweight contest.
Whyte's hopes of a mandatory shot at the WBC championship were halted after losing to Povetkin on Saturday night.
It had seemed that Whyte was in total control as the British fighter dominated the first four rounds, twice sending Povetkin to the floor in the fourth, but the Russian came up with a thunderous uppercut in the fifth.
Joshua, the WBA, IBF and WBO champion, is a Matchroom stablemate of Whyte and predicted the 32-year-old would bounce back.
Fury, who holds the WBC belt, could not resist a cheeky message on Twitter, writing "40 & proud" in a tart comment that could be perceived as praise for Povetkin but was widely taken as a jibe at Whyte for losing to such an older fighter.
Speaking on Sky Sports, Joshua praised the punching power of Povetkin, saying: "The knockouts on his highlight reel are phenomenal: they're short, they're compact."
Joshua beat Povetkin at Wembley Stadium in 2018 so managed those big shots from the Russian better than Whyte, albeit suffering a broken nose.
And Joshua said Whyte, who is seeking a rematch with Povetkin, could put the rare defeat behind him.
"Dillian has spent months and months in Portugal - training, preparing - and something like that can happen," Joshua said.
"But the training doesn't only add up to this fight with Povetkin. He's got another how many years in the sport, this is just a blip in his career.
"People are going to talk all sorts of stuff about Dillian's performance, but Dillian is a fighter so I stick with him as a fighter and say, 'Dust yourself off, get back up and go again'."
Joshua suggested Whyte should have seized the moment when he appeared to have a stranglehold on the contest.
"The fight was called 'Maximum Violence' so when he had the opportunity to take him out, I wanted to see that maximum violence," Joshua said.
"For me, when I smell blood, I go in to take somebody out. Sometimes you can get caught in the exchange, but if you leave it a round or two later as you see there, anything can happen.
"The tactics sometimes go out of the window and you've got to remember this is a fight and you've got to take the man out and move on to the next.
"Well done to Povetkin. Dillian, dust yourself off, champ, come back again."