Unified heavyweight champion Anthony Joshua suffered a “slight twinge” in his left knee while training, his spokesperson said, and was seen using crutches and wearing a brace while speaking at a Black Lives Matter rally Saturday in Watford, England.

Andy Bell, a spokesperson for Joshua, said the brace Is being worn on advice of doctors as a precautionary measure and that there is “no immediate concern” about the knee.

RELATED: Tyson Fury Wants Denzel Washington to Play Him in Big Screen Biopic

Joshua (23-1, 21 KOs) regained his titles with a unanimous decision in his rematch against Andy Ruiz on Dec. 7 in Diriyah, Saudi Arabia.

Flip the Pages to hear him talk at the rally: