Red Sox pitcher Richard Fitts, who left Monday’s game with biceps tightness, underwent a series of strength tests and has been diagnosed with right arm neuritis.

BALTIMORE (AP) — The Boston Red Sox put right-hander Richard Fitts on the 15-day injured list Tuesday with right arm neuritis.

The righthander has what the team called right arm neuritis, a temporary diagnosis until Fitts sees team doctors Friday in Boston.