White broke the news of the 145-pound bout to ESPN on Tuesday. The UFC Fight Event is scheduled to take place at TD Garden in Boston, and air on ESPN.
Magomedsharipov (17-1) is considered one of the top prospects in the sport, let alone the 145-pound weight class. The 28-year-old has rolled to a 5-0 record in the UFC, including a decision win against Jeremy Stephens in March.
Kattar (20-3) was always likely to make an appearance on the Boston card, as he fights out of Methuen, Massachusetts. Kattar, 31, is 4-1 since signing with the UFC in 2017. His wins have come against Andre Fili, Shane Burgos, Chris Fishgold and Ricardo Lamas.