Diaz has owned the International Boxing Federation belt since January when he defeated Tevin Farmer. The rematch was supposed to take place in the summer, but the contract for organizing the second fight has expired.
For Rakhimov, this will be the first chance to challenge the championship title in his career. The 26-year-old representative of Russia had his last professional fight in September last year, defeating Azinga Fuzile by TKO.