Matt Bush will undergo reconstructive surgery on his pitching elbow in the next week.
Bush, who was converted from shortstop to pitcher this season, will be out at least 14 months while he recovers from the surgery.
The injury is the latest of several setbacks for Bush since the Padres signed him for $3.15 million after going against their scouts' recommendation to draft Florida State shortstop Stephen Drew, who later signed with the Diamondbacks for $5.5 million.
Bush, converted in June from shortstop to pitcher, suffered elbow and shoulder injuries that sidelined him for 23 days last month.
In his Single-A debut for Fort Wayne, Ind., Thursday, the 21-year-old's fastball was clocked at 97-99 mph, but he clutched his elbow after throwing a curveball and departed after retiring one batter.
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