British world heavyweight champion Tyson Fury has postponed his rematch with Wladimir Klitschko for a second time because he is "medically unfit".
Promoters did not disclose details but said "the condition is too severe to allow him to participate".
Fury beat Ukraine's Klitschko on points in the first bout between the pair in November last year.
The original rematch scheduled for 9 July at Manchester Arena, was postponed in June after Fury injured his ankle.
The rearranged rematch ‑ with the WBA and WBO belts on the line ‑ had been scheduled for 29 October.
