David Haye has been forced to pull out of his proposed heavyweight title clash with Wladimir Klitschko through injury.
The British hope suffered the problem in training ahead of the eagerly-anticipated bout, which is to be screened live on Setanta.
It will be a heartbreaking blow for Haye, who championed long and hard for the opportunity to shake up the division by taking on the best in the business.
His controversial tactics in goading the Klitschko brothers into action caused a stir but, ultimately, it secured him his crack at Wladimir on June 20.
An independent verification of the injury is required before a decision on the future of the fight can be confirmed and a new date fixed for the Schalke showdown.
The event was a sell-out in Gelsenkirchen and more details will follow on the breaking news when available.