The Marlins placed Nardi on the 15-day injured list Saturday, retroactive to Thursday, with a left ribcage stress reaction.
Nardi gave up one run in 1.1 innings and took the loss during his last appearance Wednesday, and he appears to have picked up a rib injury in the process. Marlins manager Clayton McCullough relayed to reporters that Nardi has been battling through the injury for a while, and the IL stint is expected to last "much longer" than the 15-day minimum, per Ely Sussman of Fish on First. The Marlins will bring William Kempner up from Triple-A Jacksonville to round out the bullpen.