The Marlins placed Cronin on the 15-day injured list Friday with left knee tendinitis, Christina De Nicola of MLB.com reports.

Cronin (undisclosed) struck out two batters and collected a hold across two perfect innings of relief in his first two appearances of September on Wednesday and Saturday.

Cronin was removed from Thursday's game against the Rockies due to an apparent injury, Christina De Nicola of MLB.com reports.

Cronin has posted a 3.72 ERA, 1.46 WHIP and 49:17 K:BB through 46 innings with one win, two holds and zero saves over 33 appearances.

Cronin gave up a hit and struck out one in 1.2 scoreless innings Wednesday, recording his first hold of the season in a win over the Tigers.

Cronin was recalled from Triple-A Jacksonville by the Marlins on Wednesday, Christina De Nicola of MLB.com reports.

The Marlins optioned Cronin to Triple-A Jacksonville on Sunday.

Cronin will begin the season as part of the Marlins' bullpen.

The Marlins claimed Cronin off waivers from the Astros on Wednesday, Ari Alexander of KPRC 2 Houston reports.

Cronin was designated for assignment by the Astros on Wednesday, Chandler Rome of The Athletic reports.