Mets LHP Josh Smoker has 'loose bodies' in his left elbow and is on anti-inflammatory medication, GM Sandy Alderson said on Thursday.
There is no timetable for Smoker's return.
He was placed on the 10-day disabled list on Wednesday due to a left shoulder strain, with RHP Rafael Montero called up from Triple-A Las Vegas.
Zack Wheeler lasted just 1 2/3 innings during Tuesday night's loss to the Cubs, with Smoker tossing 4.0 innings in relief. Smoker allowed three runs on six hits using a career-high 81 pitches in the relief outing.
He is 1-1 with a 7.45 ERA in 22 appearances this season.
Montero, 26, has an 8.24 ERA and 2.54 WHIP in 19 2/3 innings (two starts, 11 relief appearances) for the Mets this season.