PITTSBURGH -- Javon Hargrave left Pittsburgh Steelers organized team activity (OTA) practice on Thursday with an injury, outside linebacker Arthur Moats said.

Moats said he didn't know what happened to the second-year nose tackle, but that he saw him walk off the field after the play on which he got hurt. Two other teammates, L.T. Walton and Tyler Matakevich acknowledged the injury, though noted they don't know how Hargrave got hurt.

Hargrave played 573 snaps, made 18 solo tackles, nine assisted, two sacks and recovered a fumble for a touchdown.

He did not dance afterward, which disappointed Stephon Tuitt

Daniel McCullers is his immediate backup. Tyson Alualu said he can play inside and out after the Steelers signed him this offseason on a two-year, $6 million deal, but he's been sidelined through OTAs with a calf injury, according to The Tribune-Review.

"He's in the middle," Moats said. "There's a lot of people in there man."