PITTSBURGH -- Jarred Cosart is hurting one start into his Miami Marlins' career but the right-hander isn't concerned about his strained left oblique

muscle that will force to miss is turn in the rotation Thursday at Pittsburgh.

"It's just a little tightness, nothing serious and if the World Series was tomorrow, I'd be able to pitch," Cosart said Wednesday night before the Marlins

lost 7-3 at Pittsburgh. "I'm feeling a little uncomfortable. They don't want me pitching if I'm uncomfortable and I don't want to pitch in I'm uncomfortable.

It's no big deal."

Cosart felt discomfort while playing catch before Wednesday night's game. The Marlins decided to have him skip a start and he is tentatively scheduled to

pitch next Tuesday against the St. Louis Cardinals at Marlins Park.

Cosart believes he suffered the injury last Friday night, either swinging the bat or running the bases in his Marlins' debut one day after begin acquired from

the Houston Astros in a five-player trade. He lost to the Cincinnati Reds, allowing four runs in 5 1/3 innings.

Cozart was 9-7 with a 4.41 ERA in 20 starts with the Astros.