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Just weeks out from returning to the Octagon to face Kelvin Gastelum, former UFC middleweight champion Anderson Silva has been notified of a potential anti-doping violation.

Silva was set to face Gastelum on November 25 from Shanghai, China in the main event.

UFC released a statement saying they are seeking a replacement to keep the former Ultimate Fighter winner on the card. Silva faces a lengthy suspension if found guilty, as this would be a second offense.

Below is the complete statement:

The UFC organization was notified today that the U.S. Anti-Doping Agency (USADA) has informed Anderson Silva of a potential Anti-Doping Policy violation stemming from an out-of-competition sample collected on October 26, 2017. As a result, Silva has been provisionally suspended by USADA. Due to the proximity of Silva’s upcoming scheduled bout at UFC Fight Night, Shanghai, China on November 25, 2017 against Kelvin Gastelum, Silva has been removed from the card and UFC is currently seeking a replacement.

USADA, the independent administrator of the UFC Anti-Doping Policy, will handle the results management and appropriate adjudication of this case involving Silva. Under the UFC Anti-Doping Policy, there is a full and fair legal process that is afforded to all athletes before any sanctions are imposed. Additional information will be provided at the appropriate time as the process moves forward.