The Ukrainian will step into the ring with British challenger Chisora this weekend looking to make a statement ahead of a potential showdown with Haye later this year.
The two camps have been talking about Haye coming out of retirement to fight Vitali, having been defeated by Wladimir Klitschko in their unification bout last year.
There is no love lost between Haye and the Klitschko brothers and Vitali took an opportunity at a press conference before his fight with Chisora to take another pop at the former WBA heavyweight champion.
"He [Chisora] wants to go in and fight and to go the distance. He tries to challenge his opponent and I didn't see that in the last fight between David Haye and Wladimir Klitschko," Klitschko told reporters.
"Dereck Chisora is more aggressive than David Haye.
"David Haye is so unpredictable and we tried to make a deal. I hope the fight comes through but right now we are miles apart from agreeing the contract."
Klitschko is the heavy favourite to defeat Chisora, who has only had 17 professional bouts and got the clash with the WBC champion despite having lost two of his last three fights.