The Marlins placed Nardi on the 15-day injured list Saturday with a left ribcage stress reaction, retroactive to Thursday.
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 his 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.