Boston ? Pedro Martinez is not expected to pitch for another week, Red Sox team doctor Bill Morgan said Saturday after the Boston ace experienced slight discomfort in his right side while playing catch.

Although the pain was “nothing extreme,” Morgan said, Martinez will not throw from a mound until he can throw without trouble and report back pain-free the next day.

Morgan said that’s not expected to be until “the end of the week,” which would push Martinez’s next start into early June.

Although Morgan allowed for the possibility that Martinez would feel better when he returns to the ballpark today, his timetable was less optimistic than manager Grady Little’s.

Noting that Martinez is eager to pitch against the Yankees in a three-game series that runs from Monday to Wednesday, Little said it is possible Martinez will pitch in New York.

“I think everyone feels that he will be ready later on in the week, and that includes every day after Monday,” Little said. “At this point, I don’t know how big of a possibility that will be for the Yankees series, but whenever the guy is ready to pitch, he is going to pitch.”

Martinez was scratched from Tuesday’s start against the Yankees at Fenway Park after feeling pain the previous day while playing catch in the outfield. An MRI exam showed inflammation in a tendon that indicates a strain in the latissimus dorsi, a muscle that runs from the back and around the side.

Tim Wakefield will move up a day to pitch against the Yankees Monday. Martinez will play catch again today and see how he feels. The three-time Cy Young award winner is 4-2 with a 2.83 ERA.