Tyson Fury and his cousin Hughie could be slapped with eight-year bans after UK Anti-Doping launched a second investigation into the heavyweights' failed drugs tests.
The Furys tested positive for the banned steroid nandrolone in 2015 but claimed it was due to them eating uncastrated wild boar.
That left Tyson free to return to the ring in 2018 and last month he defeated Deontay Wilder to become heavyweight world champion for a second time.
But a report in the Mail On Sunday claims a farmer was convinced to lie during the investigation and claim he sold wild boar to the Furys.
UKAD have since confirmed they will investigate and if the Furys are found guilty of tampering with the initial investigation it could mean an eight-year ban for a second offence.