Aaron Ashby will have arthroscopic surgery on his throwing shoulder and could miss the entire season.

Milwaukee Brewers manager Craig Counsell announced that Ashby would have surgery Friday in Washington.

"This puts him out for significant time," Counsell said. "You won't see him until late in the season at best."

Ashby, who turns 25 next month, went 2-10 with a 4.44 ERA and 126 strikeouts in 107 1/3 innings last season. The Brewers signed him last July to a $20.5 million, five-year contract.