The pair will square off on July 26 in Manchester, and the 'Furious One' has kicked off the verbal jousting by declaring the Londoner "a mug".
The Daily Star quotes Fury as saying: "It will be a good opportunity to make mincemeat of Dereck.
"He is a mug. He talks what he looks like - shit. Chisora looks like a villain. I describe myself as a good gentleman.
"He's got beaten before. I punch four times harder and I'm an all-round fighting man. I want to unify the world title."
The all-British heavyweight clash is an eliminator for a shot at Wladimir Klitschko's WBC crown.