Tyson Fury says WBC world heavyweight champion Deontay Wilder has “no intellect” and “no substance”.
The Briton drew with Wilder in December and a rematch against the undefeated American is set for 22 February.
And Fury, who has his first bout in WWE on Thursday, says he already has more fans than his rival in the USA.
Fury will face Braun Strowman at the WWE’s Crown Jewel event in Saudi Arabia on Thursday and was warned against the move by his team because any injury could put his February bout against Wilder at risk.
Wilder, 34, faces 40-year-old Cuban Luis Ortiz on 23 November in his 10th defence of the WBC title.