Javier Mendez called Ilia Topuria the toughest test for Usman Nurmagomedov in the UFC.
The American coach believes that the fight against "El Matador" will be the most serious challenge for the Russian fighter.
Mendes also said who he would like to see as Usman's first opponent in the UFC. Among the options, he named Ilia Topuria, Arman Tsarukyan, Paddy Pimblett, and Max Holloway.
Usman Nurmagomedov recently defended the PFL lightweight title, knocking out Archie Colgan in the first round. Following this, reports emerged about the undefeated Russian potentially moving to the UFC.