Olmos is dealing with a hamstring strain and will be reevaluated Tuesday, Michael Silverman of MLB.com reports.
The southpaw has been impressive in six games with the Red Sox this spring, allowing just one run across 7.2 innings while striking out 11 and walking two. Consider the 26-year-old day-to-day for the time being. He's been doing a good job staking his claim to a spot in the crowded Boston bullpen, but this setback will likely see him start the year with Triple-A Norfolk.