Major League Baseball suspended the Seattle Mariers’ Robinson Cano for 80 games without pay on Tuesday after the All-Star second baseman tested positive for a banned substance, MLB.com reported.

Cano tested positive for the diuretic Furosemide, which violates the MLB’s drug prevention and treatment program. He said he has no plans to fight the suspension, which is set to begin immediately.

“Recently I learned that I tested positive for a substance called Furosemide, which is not a performance enhancing substance,” Cano said in a statement released by the MLB Players Association. “… For more than 15 years, playing professional baseball has been the greatest honor and privilege of my life. I would never do anything to cheat the rules of the game that I love, and after undergoing dozens of drug tests over more than a decade, I have never tested positive for a performance enhancing substance for the simple reason that I have never taken one.:

Quoting a source familiar with the case, ESPN reports that Cano tested positive before the season even began and immediately appealed the findings. During the appeal, however, MLB was reportedly able to prove Cano intended to use  Furosemide as a masking agent, which league policy dictates must be done in order to prove a player’s intent. Cano subsequently dropped his appeal, the source said.

Cano later said he was given the drug by a licensed doctor in his native Dominican Republic and that the substance is used to treat “various medical conditions” there and in the United States.

“While I did not realize at the time that I was given a medication that was banned, I obviously now wish that I had been more careful,” Cano said.