The Red Sox are hopeful Drew Pomeranz will make his first start as planned on April 9, but the lefty will begin the season on the disabled list with a forearm flexor strain.
Boston placed Pomeranz on the 10-day DL on Thursday, a day after manager John Farrell admitted he couldn't put his "rubber stamp" of approval yet on the lefty.
Pomeranz has not suffered a new injury, but he is still being stretched out after a triceps injury delayed his progress this spring. Pomeranz last pitched Wednesday, allowing three runs in four innings to the Twins.