Pomeranz complained of tightness in his left triceps, a sensation that developed in the first inning against the Minnesota Twins and persisted through the second. He threw 47 pitches and didn't come out for a third scheduled inning.
Although Pomeranz described the issue as "nothing crazy" and told reporters he doesn't believe it's anything serious, the Red Sox must be wary. Pomeranz experienced left elbow/forearm stiffness late last season and received a stem-cell injection over the winter.
"It's not related to the area that was addressed in the offseason," Red Sox manager John Farrell told reporters Sunday, nevertheless adding that the team will "be careful" with Pomeranz.
Pomeranz will make his next scheduled start Friday, Farrell told reporters Monday.
The Red Sox's pitching depth is already being tested. Veteran right-hander Clay Buchholz was dealt to the Philadelphia Phillies for minor league infielder Josh Tobias in December in order to create payroll flexibility, and lefty David Price has not yet made a spring training start because of elbow stiffness and is set to open the season on the disabled list. The Sox still have five major league starters (Rick Porcello, Chris Sale, Eduardo Rodriguez, Steven Wright and Pomeranz), but Triple-A option Henry Owens has slid on the depth chart during a horrendous spring in which he is overhauling his mechanics.
If Pomeranz is not ready to begin the season on time, veteran right-hander Kyle Kendrick likely would be first in line to take his spot. Kendrick hasn't allowed a run in 15 consecutive spring training innings and has a 1.50 ERA in 18 innings overall.
The Red Sox acquired Pomeranz from the San Diego Padres last July for 19-year-old pitching prospect Anderson Espinoza. An investigation by Major League Baseball revealed that the Padres failed to disclose Pomeranz's accurate medical information, but the Red Sox declined the chance to rescind the trade.