Welington Castillo of the Chicago White Sox will be suspended 80 games for violating the league's joint drug agreement, according to a source.

It was not immediately clear what Castillo will be suspended for, but the source said it was not for a steroid.

Castillo, 31, is hitting .270 with six home runs and 15 RBIs for the White Sox this season.

Robinson Cano has been suspended 80 games without pay by Major League Baseball after he tested positive for a banned substance.

Cano tested positive for the diuretic furosemide, which violates MLB's drug prevention and treatment program.

"Recently I learned that I tested positive for a substance called Furosemide, which is not a performance enhancing substance," Cano said in a statement. "... 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."

Under MLB's drug policy, a player is not automatically suspended for use of a diuretic unless MLB can prove he intended to use it as a masking agent.

Cano tested positive before the season and appealed, according to a source. During the appeal, MLB apparently was able to determine his intent, which resulted in Cano dropping his appeal, the source said.

Major League Baseball announced on Monday that Roberto Osuna will remain on administrative leave through at least May 21.

The Toronto Blue Jays pitcher was first placed on leave on May 8, after it was revealed that he had been arrested and charged with domestic assault.