LONDON (Reuters) - WBA light-welterweight champion Amir Khan will take on IBF holder Zab Judah in a unification fight in Las Vegas on July 23, the Briton said on his Twitter page.

"July 23, WBA/IBF unification fight. KHAN vs JUDAH. Mandalay Bay," the 24-year-old former Olympic silver medalist, who beat Paul McCloskey in April, wrote.

(Reporting by Martyn Herman; Editing by Peter Rutherford)