The scheduled flyweight championship fight between current titleholder Muhammad Mokaev and Warren Mason has been cancelled.

The fight was supposed to take place at Tanko FC 4 on Friday. Harry Williams was first to raise concerns about the fight, and The Sprawl’s John King later confirmed with Mokaev.

Mokaev, who holds an amateur record of 5-0, confirmed to The Sprawl that his fight with Warren Mason had been cancelled, after Mason had collapsed in the sauna one hour before weigh ins. The Team Kaobon product confirmed that the promotion were still looking for an opponent, but it is looking unlikely.

Tanko FC 4 takes place tomorrow, Friday, May 12, from the Victoria Warehouse in Manchester, England.