World champion Nathan Cleverly has been forced to withdraw from his WBO light-heavyweight title defence against Robin Krasniqi due to a viral infection.

The unbeaten Welsh star was scheduled to face Kosovan Krasniqi on April 28 at the Royal Albert Hall in London, but has been unable to train for his fourth title defence.

George Groves has pulled out of his world super-middleweight title fight with Robert Stieglitz through injury having been due to travel to Germany on May 5 to face the WBO belt holder.

This is the second fight Groves has failed to make this year after a back injury forced the postponment of his rematch with Kenny Anderson at Wembley Arena in March.

Robert Guerrero pulled out of his upcoming WBA light-welterweight title fight against Marcos Maidana on Thursday after injuring his left shoulder during training.