Rockies right-hander RJ Petit has been diagnosed with a sprained ulnar collateral ligament in his right elbow, the team announced to reporters at their spring complex (via Thomas Harding of MLB.com). He’s being sent for further evaluation before next steps are determined. Every case is different, of course, but the majority of UCL sprains result in surgery, be it an internal brace to stabilize/strengthen the existing ligament or a full UCL reconstruction (Tommy John surgery). The Rockies have not yet said whether surgery is an option for Petit.
Petit was the top pick in this December’s Rule 5 Draft. The Rockies plucked the towering 6’8″ righty from the Tigers system after Detroit left him unprotected despite a strong minor league track record. In 66 1/3 innings between Double-A and Triple-A this past season, Petit notched a 2.44 earned run average with a hefty 29.5% strikeout rate against a nice 8.2% walk rate. He sits 95 mph with his four-seamer, and that velocity plays up further due to the extension he gets from that 6’8″ frame and his long limbs. He allowed three runs in four spring innings prior to sustaining the ligament injury.
The Rockies had hoped that Petit could claim a spot in a wide-open bullpen mix that opened up even further with the offseason trade of Angel Chivilli and the elbow injury to DFA pickup Pierson Ohl (which will require Tommy John surgery). Petit will instead be looking at a notable absence, regardless of whether he requires surgery.
If the Rockies want to hang onto Petit, they’re able to do so. He can be placed on the 60-day injured list and spend the entire season there if need be — so long as the team is willing to give him major league service time and pay for that IL time. In that scenario, Petit’s Rule 5 designation would carry over into the 2027 season. The Rockies would thus be unable to option him to the minor leagues until he spent at least 90 days on the active roster.
For a club in the Rockies’ position, that may not be a dealbreaker. The overhauled Colorado front office, led by new president of baseball operations Paul DePodesta and general manager Josh Byrnes, certainly isn’t viewing the 2026 season as one in which the club will be competitive. They liked Petit’s arm enough to take him with the top pick in the Rule 5 Draft, and even in the unfortunate event that he’s out until next season, they’d still control the right-hander through at least 2031 after he meets the criteria to shed that Rule 5 status.
