Diaz was removed from Thursday's game in Baltimore in the fifth inning with right groin tightness, Ryan Bass of FanDuel Sports Network Sun reports.
Diaz went 1-for-2 with a single and a run scored before being lifted for a pinch hitter. With just three games remaining, the injury could end Diaz's season even if it's just a day-to-day issue. The Rays could provide more on his status after Thursday's contest.