Righthander Mike Stutes will have arthroscopic shoulder surgery Tuesday, a source said. Stutes, on the disabled list since late April, could miss the rest of the season.

The surgery will clean out fraying from Stutes' shoulder. There is believed to be no serious damage to his rotator cuff, which would portend a lengthier absence.

Stutes, 25, complained of shoulder pain late in spring training but started the season on the active roster. He appeared in six games and posted a 6.35 ERA before being placed on the disabled list April 22.

He had been training in Florida with the hopes a rest program would cure his shoulder pain. Instead, surgery is necessary.

The Phillies have already lost two righthanded relievers — Jose Contreras and David Herndon — to season-ending Tommy John surgeries on their injured elbows.

Have a question? Send it to Matt Gelb's Mailbag.