NEW YORK — Former major leaguer Jesus Montero has been suspended 50 games after testing positive for a stimulant, his second penalty for a banned substance.

Montero spent this season with Toronto's Triple-A Buffalo team, batting .317 with 11 home runs and 60 RBIs. He was a designated hitter and first baseman and was picked as an International League All-Star.

The commissioner's office made the announcement Thursday. Because the minor league season is over, the suspension will take effect at the start of next year.

Montero tested positive for dimethylbutylamine.

In August 2013, Montero drew a 50-game drug ban — he was among several players disciplined by Major League Baseball for their relationship to Biogenesis of America, a Florida anti-aging clinic accused of distributing banned performance-enhancing drugs.

The 26-year-old Montero made his big league debut with the New York Yankees in 2011 and was traded to Seattle after the season for pitcher Michael Pineda. Montero played for the Mariners last year.

In 2014, Montero was sent home by the Mariners late in the season after having a run-in with a Seattle scout at a minor league game.

There have been 84 suspensions this year under the minor league drug program and 13 under the major league program.