Former heavyweight king Wladimir Klitschko believes ex-opponent Tyson Fury would be no match for Anthony Joshua if they fought in the future.
Retired Klitschko, who lost to both men, is convinced Joshua has too much in his locker for the soon-to-be-returning Fury.
With his last fight coming against Klitschko way back in November 2015, Fury recently announced his intention to make a comeback on June 9, although the Ukrainian is not sure 'The Gypsy King' can sustain it.
"Hands down Joshua (beats Tyson Fury)," Klitschko told The Sunday Times. "He is getting to be the complete fighter.
"Technically, size-wise, weight-wise, power-wise. And he is a good learner.
"The other guy (Tyson Fury), like a fart in the wind it is there and it is gone.
"In the history of boxing, there are a lot of examples of this kind of guy.
"They can be successful for a time but are not disciplined enough to continue to be successful.
"I wish Tyson well but I think there is a lack of discipline there, and discipline is more important than motivation.
"Drawing from my experience I would say it is going to be very difficult for Tyson because there's that lack of discipline," he added.
Fury is lining up lower-key opposition to begin with despite hoping to pack-out Manchester Arena this summer, before possibly stepping up to battle the likes of Shannon Briggs or Manuel Charr.
A win over the latter, who holds the WBA 'regular' title, would position Fury as the number one contender to Joshua and mean a 2019 clash would be on the cards.
The more likely scenario would be Fury competing in two or three contests to get the feel for the ring again before potentially signing up for a huge Wembley battle with Joshua in 2020.
Deontay Wilder could upset those plans when he fights Joshua, although Fury was already confirmed his interest in facing the American should he be able to dethrone the 2012 Olympic champion.