UK Anti-Doping said traces of the banned substance nandrolone were found in a urine sample of Tyson Fury and his cousin Hughie Fury, also a boxer, in February 2015.
Fury's legal team has denied the claims, saying it will be challenging UK Anti-Doping's charge and also suing the organisation for claiming they'd taken illegal drugs when they didn't.
Peter Fury, the trainer of both Tyson and Hughie Fury, posted a series of tweets asserting the pair's innocence:
Ankle injury genuine. But hey" within 45min of announcement they get suspended??? Bad smell & judge sees it. Charges" more like bog Roll.— peter fury. (@peterfury) August 3, 2016
We want all out in open advised my legal team to out as much as possible. The world can view this scam for what it really is.— peter fury. (@peterfury) August 3, 2016
People need & should respect findings of any tribunal. Remember they hear the real facts & not you the speculator.— peter fury. (@peterfury) August 4, 2016
A spokeswoman from UK Anti-Doping said: "UK Anti-Doping can confirm that both boxers were charged on 24 June, 2016 with presence of a prohibited substance.
"The UK Anti-Doping Rules allow athletes to challenge the imposition of a provisional suspension and the independent National Anti-Doping Panel (NADP) today lifted the athletes' suspensions, pending full determination of the charges.
"These charges will be heard at a hearing before the NADP in due course."
Tyson Fury became one of the world's top boxers when he beat former Heavyweight Champion Wladimir Klitschko last November.
He regularly talks about his faith while his Twitter description says: "What the Lord gives, he can take away, repent of your sins, Jesus Lord of Lords, King of Kings" and "Trying to live by God's word".