Back in November 2015, Fury shocked the world when he defeated Klitschko in Germany to win the WBA, WBO, IBF and IBO heavyweight world titles.
It was a masterful performance from the Gypsy King as Klitschko barely landed a punch on him in the 12 rounds.
All three judges gave it to the 3/1 underdog Fury, 115-112, 115-112, 116-111.
Now, as Fury prepares to challenge Wilder for his WBC belt, he has claimed that the American was put on the seat of his pants in a training session with Klitschko.
Asked whether Wilder would prove more of a challenge than Klitschko did back in 2015, Fury told iFL TV: "No way. Nowhere near.
"Wilder ain't on Wladimir Klitschko's level and I heard off a good source that when Klitschko and Wilder sparred, Klitschko dropped him twice, twice.
"He got out the ring and he couldn't continue. Klitschko didn't even land a glove on me."
GLOVES ARE OFF All you need to know ahead of Fury vs Wilder world title clash
Fury – Wilder wanted to get the fight cancelled
TYSON FURY believes Deontay Wilder wanted to start a riot so their fight would be cancelled and the Gypsy King slapped with a massive fine.
The final press conference for the Saturday night WBC heavyweight world title showdown was a cordial event for around 30 minutes before a late scuffle.
The Bronze Bomber shoved Fury’s promoter Frank Warren out of the face-off and the American’s team surged forward and allegedly threw punches.
Fury said: “I think Wilder's nervous; he felt he needed to scream and shout and make threats.
"I believe Wilder wanted me to aim the left hook so that the fight would be cancelled."
Click here to read more and see photos from the explosive press conference
It is not known when this sparring happened, but Fury was adamant it was a true story.
The Gypsy King heads into the clash as underdog, just like he did when he shocked the world and dethroned the great Klitschko back in 2015.
But standing in the way is the brash, undefeated monster puncher Wilder.
The American has knocked out every single one of his opponents, winning all 40 of his fights.
The only person to take him to points was Bermane Stiverne in 2015 – but then the Bronze Bomber knocked him out in a rematch two years later.
Fury and Wilder almost came to blows at the final press conference as the Gypsy King removed his shirt.
Speaking about the bust-up, Fury said: "I took my shirt off to get involved and frightened them all away.
"Everyone thinks the rivalry is fake but they can guess again as it nearly went off again.
"Wilder thought he needed to spit in my face or whatever he was doing, shouting. He feels pressured, you can see the pressure he is under out there."
Wilder was generally quiet in the press conference but did say Fury only became a champion "in a small country".
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