This story was updated at 5:32 p.m.

Washington Nationals catcher Tres Barrera is suing Major League Baseball over the league’s decisio to suspend him for 80 games.

Barrera was suspended after testing positive for the drug Dehydrochlormethyltestosterone, Major League Baseball said Saturday.

Taking the drug, a performance-enhancing substance used by athletes in the former East Germany, is a violation of MLB’s Joint Drug Prevention and Treatment Program. Barrera, who is 25, will not receive pay during his suspension.

Barrera, who is 25 and made his debut with the team in September, said in a statement shared by the MLB Players Association that he had gone through an appeals process, but that an arbitrator had decided to uphold the decision. He is now filing a lawsuit against Major League Baseball challenging the arbitor’s decision. The complaint calls his positive test the result of”junk science.” As Bloomberg Law first reported, the lawsuit is a potential class action though it does provide details about other potential class members suspended for using this drug.

The complaint questions the accuracy of the test and also alleges the amount of banned substance found in Barrera’s sample was “so minimally low that it did not–and could not–have provided him with any performance enhancing benefit whatsoever.”

Barrera released a statement earlier which said he was surprised by the failed drug test.

“From the initial failed drug test to losing the appeal, this has all come as a complete surprise as I have never, and will never knowingly use a banned substance,” Barrera said. “I have worked too hard and given too much to this sport to disrespect or cheat the game that I love.”

He continued, “I would never do anything to dishonor my family, teammates, and coaches or do anything to let down the many young ball players that look up to me.”

Barrera apologized to his teammates, family, and fans for the “negative attention” the suspension had brought, and said he would work to clear his name.

Barrera was set to be one of the team’s extra catchers behind Kurt Suzuki and Yan Gomes during this year’s shortened 60-game season, according to the Washington Post.

The news comes just days after the Nationals played their first game of the season on an unusual opening day last week, which had been delayed by COVID-19 and saw the team play to an empty stadium while a few fans gathered outside the locked gates at Nationals Park.

Just before the game, the team announced that its star outfielder, Juan Soto, had tested positive for coronavirus, and would not play. He tested negative for the virus on Saturday, according to Post’s Jesse Dougherty, but needs back-to-back negative tests at least one day apart before being allowed to return.

Other players, including first baseman Ryan Zimmerman and pitcher Joe Ross, previously opted out of the season due to health and safety concerns around the virus.

Hannah Schuster contributed reporting.