Nothing. All we need is for Vitali to pay Solis step-aside money, so we can get a unification. That's in Vitali's hands though, not Haye's.
Vitali is fighting March 19th. Plenty of time for him to be ready by July 2nd. Why does Haye have no interest in Vitali? From Dan Rafael's ESPN Chat today:
He isn't certain to be fighting them. Why not just go to the WBC, ask them to postpone his mandatory in favour of a unification? The ball is in his case, without doubt. He doesn't have a fight signed yet and can still opt to fight Haye. And if K2 said that, it must be true? This is why Rafael is such a **** journalist. There isn't one promotional company out there, who have as many accusations of bull**** as K2, yet their word is gospel? Please.
Haye can't fight until July 2nd because of Sky. There is PLENTY of time after Vitali fights Solis to make the fight. The Solis fight is not blocking anything that has NOTHING to do with it.