UFC athletes Ruslan Magomedov and Zubaira Tukhugov have tested positive for a prohibited substance and have each accepted a two-year sanction for their anti-doping policy violations. 

The news comes from a USADA press release issued Thursday. 

Both Magomedov and Tukhugov tested positive for ostarine following an out-of-competitive test administered Sept. 7, 2016. Tukhugov also tested positive for the same substance during a test given Oct. 29, 2016. However, since both tests were collected before Tukhugov was made aware of the first failure, both tests were treated as one singular violation of the UFC's Anti-Doping Policy. 

According to a USADA statement: "Following notification of their positive tests, both Magomedov and Tukhugov claimed they had tested positive due to their use of a contaminated supplement, which USADA was unable to confirm at that time to justify a reduction from the maximum two-year period of ineligibility for a non-Specified Substance.

"Magomedov and Tukhugov subsequently exercised their right to have their cases submitted to a neutral arbitrator for resolution." 

That didn't go their way, however, and both men received two-year sanctions after a multi-day hearing. They also contributed a total of $10,000 toward "costs of the arbitration proceedings." 

The suspension is retroactive, meaning their two-year period of ineligibility began Sept. 26, 2016. They must remain in the USADA testing pool during the suspension and can return to action once their two-year bans are served later this year.

The 31-year-old Magomedov is 3-0 in the UFC's heavyweight division but has not competed since October 2015 at UFC 192. 

Tukhugov, a featherweight, last fought in May 2016 at UFC 198, losing a decision to Renato "Moicano" Carneiro.