David Haye could be set for a massive fight with one of the Klitschko brothers at Wembley Stadium. Britain's newest heavyweight world champion is still nursing a broken hand after winning the WBA title against giant Russian Nikolai Valuev in Germany on Saturday. But Adam Booth, Haye's trainer, revealed that discussions with Wembley Stadium are already under way following his victory and the fight could take place next summer. "Wembley have already been on to me," said Booth. "Haye against a Klitschko, Wladimir or Vitali, would be one of the biggest fights in heavyweight history." However, Haye, 29, still has to defend his title with a mandatory fight against challenger John Ruiz before then. "Ruiz is the mandatory challenger for the WBA title so if I don't fight him they'll take the title from me, and I don't fancy giving it up after winning it," said Haye. "I feel I can knock out John Ruiz." His fight against Ruiz will almost certainly be held at the O2 Arena with victory setting up a lucrative unifying heavyweight division fight against one of the Klitschkos. Ruiz was paid to step aside and let Haye have the chance of taking the World Boxing Association's belt from Valuev. But the contest is unlikely to take place before next May with Haye forced to let his broken hand, sustained in the second round against Valuev, heal completely.