The Phillies said Halladay had an arthroscopic evaluation and underwent debridement of his labrum and rotator cuff as well as removal of an inflamed bursa on Wednesday. If all goes well and Halladay is able to start his throwing program on time, it's likely he'll be sidelined until at least after the All-Star break.
A two-time Cy Young Award winner, the 35-year-old right-hander is 2-4 with an 8.65 ERA in seven starts this season after missing nearly two months last year because of a strained back muscle.
If history is any indication, the odds are against Halladay re-establishing himself. According to FanGraphs.com, players over the age of 35 who went on the DL for any sort of shoulder injury averaged only 59 innings over the course of the rest of their career.
Information from The Associated Press was used in this report.