The Red Sox placed Booser on the 15-day injured list Wednesday with left elbow inflammation, Ian Browne of MLB.com reports.
Booser failed to retire any of the three batters he faced in Tuesday's win over the Rangers, but it appears his elbow might have been bothering him in the outing. It's not clear at this point how much time he might miss. Brennan Bernardino was called up from Triple-A Worcester to replace Booser in the bullpen.