Phillies 2008 supplemental first-round pick Zach Collier was suspended Thursday by Major League Baseball for 50 games after testing positive for an amphetamine.

A pair of minor league free agents, pitcher Alejandro Montas and catcher Gustavo Parra, also were suspended.

Collier struggled with injuries and his own lack of power in his first two full pro seasons, falling out of the Phillies' Top 30 prospects. But he had a decent season in 2011, hitting .255/.328/.349 with 35 stolen bases in 48 attempts, and he'd finished on a strong note, going 8-for-19 in September (.421). He'll serve his suspension in the first 50 games of 2012.

Montas and Parra previously were in the Orioles organization in the Rookie-level Dominican Summer League. Montas posted a 12.00 ERA there this summer, while Parra had hit .186.