Olympic wrestling medallists Bilal Makhov and Jenny Fransson have been provisionally suspended from competition following positive drug tests.
Makhov, an Olympic bronze medallist at London 2012, reportedly tested positive for a growth hormone.
The positive test was confirmed by Mikhail Mamiashvili, President of the Russian Wrestling Federation.
"Makhov has been found guilty of doping abuse and we will be investigating this incident," Mamiashvili told Russia's official state news agency TASS.
"I held a meeting with Bilyal after I received an official information, my stance is that I have a document on the table and the rest is just a cheap talk.
"He is not holding a stance of the categorical denial, says it is possible that a growth hormone was in his body, explaining it that his wife was taking medical preparations at the moment and some of them may contain this substance.
"The doping sample was taken at his house and they arrived at his house at five in the morning."
A lawyer for Makhov, a three-time world champion, has called for the public to not rush to judgement over the doping case.
The Swedish Wrestling Association have also confirmed Fransson, a Rio 2016 bronze medallist, has been provisionally suspended.
A sample from Fransson, taken on January 9, reportedly contained traces of the anabolic steroid methyltestosterone.
"Jenny Fransson is now interminably suspended until the B test has been analysed," a Swedish Wrestling Association statement read.
"As a union, we will support Jenny in the difficult process that she now has before her.
"The Swedish Wrestling Association works actively to pursue a pure sport."
The statement added: "All our national team activists are well educated regarding the anti-doping regulations.
"Wrestling is a noble sport where two people compete against each other without equipment and modern technology.
"It is one of the purest forms of sport, and to compete on equal terms is and remains one of the cornerstones of wrestling."
Fransson has reportedly claimed the substance was ingested by mistake.
"Last Thursday [the day she received notification of the positive test] my whole life collapsed," Fransson wrote on Instagram.
"Everything I fought for and everything I stand for.
"Who I am and who I want to become.
"Something that I never even thought could happen to me has now happened and right now I feel more dead than alive.
"But I try to take one day at a time and not forget who I am and what I am worth."
Fransson is currently ranked second in the world rankings for the women’s under-68 kilogram category and won a silver medal at last year’s World Championships.
The 32-year-old, who earned the 72kg world title in 2012, will be unable to compete at the upcoming European Championships in Rome.
Fransson was the 2018 European champion and won bronze in both 2008 and 2019.