Dice-K is headed to the DL with an elbow injury.
Matsuzaka had an MRI on Tuesday. Francona says the elbow is sprained and Matsuzaka will be going on the DL. The Red Sox had not yet officially made the move as of Tuesday night, when their home game against Baltimore was postponed because of rain.
Matsuzaka had control problems in his start Monday night against the Orioles.
Francona says there is no timetable on Matsuzaka's return.
Boston also put RHP John Lackey on the DL on this week, leaving them without two of their starters indefinitely.