Marlins right-handed reliever Aaron Crow will likely need Tommy John surgery after an MRI revealed a ligament tear, Joe Frisaro of MLB.com reports on Twitter. Miami added Crow in late November in a trade that cost the team lefty Brian Flynn.

Losing Crow would be a significant blow to the club’s bullpen, which had hoped to enjoy a return to form from the 28-year-old. After a three-year run in which he carried a 3.19 ERA with 9.0 K/9 and 3.9 BB/9, with heavy groundball tendencies, Crow fell back last year to a 4.12 earned run mark while striking out just 5.2 and walking 3.7 batters per nine. He had put up more typical numbers this spring, however.

While Miami does have several options to step in for Crow, it is possible to imagine the team looking for an outside replacement. Whether that would mean picking up a veteran roster castaway or striking a deal, of course, remains to be seen.