Initially, the Marlins were leaning toward having the right-hander rejoin the rotation sometime next week. But as of Wednesday, nothing has officially been announced as to whether Cosart will return to the club or make another rehab assignment start.
"To be determined," manager Dan Jennings said.
On the disabled list retroactive to May 14 with vertigo, Cosart threw 5 1/3 innings on Tuesday night in a rehab outing for Triple-A New Orleans at Round Rock. The 25-year-old gave up four runs on seven hits with two walks and six strikeouts in a no-decision.
Cosart ran his pitch count up to 103, with 67 strikes.
In seven starts with the Marlins, Cosart is 1-3 with a 4.08 ERA, and he last saw action on May 13 at the Dodgers.
Jennings said he still must meet with the front office to determine what to do with the rotation.
"We'll come up with what is going to be our best plans going forward," Jennings said.
The emergence of rookie Jose Urena, plus steady contributions from David Phelps and Tom Koehler, have the Marlins rethinking their starting five.