Drew Pomeranz walked off the mound before the start of fourth inning with left triceps tightness on Sunday.

"I felt something in warmups kind of similar to what I felt in spring training," he said.

He will get an MRI Monday as a precaution, but Pomeranz said he expects to make his next start for the Boston Red Sox.

"He wasn't able to reproduce any symptoms later in the day," John Farrell said. "We'll see what transpires tomorrow. We don't think this is anything long term."