Major League Baseball will not suspend Ponson. Under the drug rules, he will be treated as a first-time offender and is subject to a medical review and fine.

Ponson, 32, pitched well for the Netherlands last March in the WBC and later signed with Kansas City. He is 1-5 with a 7.27 ERA for the Royals, and is currently on the disabled list because of a strained right elbow.

The International Baseball Federation said Ponson tested positive for Phentermine. Chicago Cubs catcher Geovany Soto tested positive for marijuana at the WBC.