NEW YORK (AP) – Kansas City Royals prospect Raul Mondesi Jr. has been suspended for 50 games for testing positive for clenbuterol, a banned steroid.

The penalty was announced Tuesday against the 20-year-old infielder, who is on Kansas City’s 40-man roster but had been optioned to Double-A.

Mondesi Jr. is the son of former NL Rookie of the Year Raul Mondesi. The younger Mondesi was the first player to make his big league debut in the World Series.

A positive test for a performance-enhancing drug usually results in an 80-game suspension, but Major League Baseball and the players’ union agreed to the reduced punishment after Mondesi Jr. showed the steroid came from cold medicine. Mondesi Jr. says he took the over-the-counter medication without reading the label or consulting his trainer.

He apologized and said he never intended to “take a substance that would give me an unfair advantage on the field.”

The Kansas City Royals were notified this afternoon of the 50-game suspension given to infielder Raul Mondesi Jr. Below is a statement from Royals’ Senior Vice President and General Manager Dayton Moore:

“This is an unfortunate incident that we believe to be an innocent mistake, but these are the consequences that players face when they do not adhere to the policies that have been collectively bargained. We have a protocol in place with our medical team should a player ever have questions about what they may be taking, even if an over-the-counter medication. In this particular case the protocol was not followed and the consequences are such. We remain supportive of Raul Mondesi Jr.”