Center Scott Mruczkowski was placed on injured reserve Tuesday by the San Diego Chargers, meaning his season is over.

Mruczkowski injured his right ankle during the game-winning drive in Sunday's 27-24 victory against Cincinnati. Mruczkowski started the last 13 games at center after Nick Hardwick hurt an ankle in the season opener at Oakland, requiring surgery.

Hardwick might return in Friday night's game at Tennessee.

"He took a pretty good number of reps today and we'll see how he feels tomorrow," coach Norv Turner said.

To replace Mruczkowski on the active roster, the Chargers signed Eric Ghiacuic. He started 42 of 48 games at center from 2005-08 with Cincinnati. He signed with the Kansas City Chiefs as an unrestricted free agent in 2009 and was released after training camp.