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1/10/2014 6:28 P.M. ET

Prospects Morgan, Watson likely out until August

PHILADELPHIA -- If Phillies prospect Adam Morgan had remained healthy last season, he almost certainly would have joined the big league rotation.

But he suffered a left shoulder injury, which ultimately required surgery this month. Phillies assistant general manager Benny Looper said Morgan might not be back until August, at the earliest. Fellow prospect Shane Watson is scheduled to have right shoulder surgery shortly. He also is expected to be out until August.

Morgan, the No. 6 prospect in the Phils' system in the most recent MLB.com ranking, suffered shoulder problems early last season, but after an MRI exam, doctors prescribed rest.

"He took off the time we wanted him to and the doctors wanted him to," Looper said."But then he started his throwing program and it still bothered him, so he had it looked at again and the decision was made that it was best to have surgery."

Morgan impressed Phillies officials last spring in Clearwater, Fla., and it seemed only a matter of time before he would join the big leagues.

"He was a guy that was close," Looper said. "I know it's hard for us, because it decreases our starting-pitching depth, but it's more of a blow for him. He loses a year here. And really, including last year, he loses a year plus."

The Phillies selected Morgan in the third round of the 2011 First-Year Player Draft. He went 2-7 with a 4.04 ERA in 16 starts with Triple-A Lehigh Valley last season. The Phillies selected Watson, ranked No. 8 by MLB.com, in the first round in 2012. He went 4-6 with a 4.75 ERA in 16 starts with Class A Lakewood.

Todd Zolecki is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.