The Diamondbacks are pausing Eduardo Rodriguez’s throwing program after the southpaw reported continued lat tightness, manager Torey Lovullo told reporters (video provided by Arizona Sports). It’s unclear for how long he’ll be shut down, but it represents a setback in his efforts to make his team debut.

Rodriguez suffered a lat strain during his fourth Spring Training appearance. He started the season on the 15-day injured list. The Snakes reportedly expected him to be sidelined for around a month, though this will surely push that timetable back. It’s an inauspicious start to his four-year, $80MM free agent deal.

Arizona viewed Rodriguez as the necessary upper mid-rotation arm to slot behind Zac Gallen and Merrill Kelly. He turned in that level of production for the Tigers a year ago, working to a career-low 3.30 ERA with solid strikeout and walk rates over 152 2/3 innings. While there’s still plenty of time for Rodriguez to meet the organization’s expectations, it seems likely he’ll at least be out of action into May.

Within weeks of Rodriguez’s injury, the D-Backs made a surprising late strike for Jordan Montgomery. Perhaps Arizona would have found the southpaw’s asking price (one year, $25MM with a vesting player option for 2025) too good to pass up in any case. That addition could take on added importance in the wake of this setback. Montgomery is building into game shape with Triple-A Reno and is expected to be called to the majors by the end of next week.

Gallen and Kelly are again off to excellent starts, yet the final three rotation spots have been a problem. Brandon Pfaadt isn’t in any danger of losing his job but is sitting on a 6.48 ERA through his first three starts. Tommy Henry has allowed 10 runs over 14 innings, while Ryne Nelson has been tagged for eight runs in 7 2/3 frames over his first two outings. One of Nelson or Henry seems likely to head to Triple-A once Montgomery is ready to step into the big league staff.