A 21-year-old right-hander, Jeffress also was suspended for 50 games on Aug. 30, 2007. He was Milwaukee's top pick in the 2006 amateur draft, the 16th selection overall, and received a $1.55 million signing bonus.

He was 2-1 with a 2.18 ERA in five starts and one relief appearance for Class-A Brevard County of the Florida State League when he was suspended Monday. He went 1-3 with a 7.57 ERA in eight starts for Class AA Huntsville of the Southern League earlier this season.

"We are obviously disappointed because Jeremy has such great major league potential, and this is a setback in his career," Brewers general manager Doug Melvin said in a statement. "We will continue to assist Jeremy and help him with his problem as long as he wants to help himself."