The Philadelphia Inquirer reports that Roy Halladay is likely headed to the disabled list with a shoulder injury. The severity of the injury isn't yet known, but Halladay said that he's been dealing with shoulder discomfort since his April 24 start against the Pirates. He'll be examined by Dr. Lewis Yocum early this week before the any decisions are made. Triple-A starters Adam Morgan and Tyler Cloyd are candidate to take his spot in the Phillies' rotation.