The World Boxing Council (WBC) has released drug test results for Tyson Fury and Deontay Wilder, after their fight last month.
The tests were carried out by the Voluntary Anti-Doping Association (VADA).
Fury produced an impressive performance to defeat Wilder by TKO in the seventh round and claim the WBC heavyweight title.
The WBC has now confirmed in a statement that both fighters passed all of their tests.
He says: “World Boxing Council heavyweight champion Tyson Fury and Deontay Wilder came out clean in doping tests conducted by the Voluntary Anti-Doping Association as part of the successful Clean Boxing Program.
"We want to thank both warriors and their respective teams for their willingness to enroll in the Clean Boxing Program and demonstrate that they are both exemplary athletes, bearing witness to their honesty and commitment to boxing."
Fury will now face Wilder in a trilogy fight in July, after the Bronze Bomber activated the rematch option.