Kell Brook and Kevin Mitchell have been added to the Amir Khan-Andreas Kotelnik bill on July 18.
Should Mitchell win his contest he will be rewarded with a world title bout against Roman Martinez in September.
The WBO super-featherweight champion beat Mitchell's stablemate Nicky Cook in March so he will double motivation to get the chance to fight the Puerto Rican fighter.
British welterweight champion Brook will defend his belt on the night against an opponent to be revealed at a later date.
This means there will now be three British title scraps on the bill as Matthew Hall and Anthony Small will compete for the vacant light middleweight Lonsdale strap and Matthew Macklin will defend his middleweight championship.