Merriman practices some for San Diego

Posted by ESPN.com’s Bill Williamson

The San Diego Chargers may finally be getting some of their health back.

Star linebacker Shawne Merriman practiced on a limited basis on Thursday as the Chargers prepare for Sunday night’s game at Pittsburgh. Merriman didn’t practice Wednesday because of a groin injury that kept him out of parts of the past two games.

Merriman’s presence in some of practice Thursday doesn’t mean he will play Sunday, but it did represent some progress. Merriman will likely be a game-time decision.

Meanwhile, San Diego running back LaDainian Tomlinson made continued strides toward playing Sunday. He practiced fully for the second straight day. Tomlinson missed the past two games with an ankle injury. It appears, unless there is a setback, Tomlinson will play Sunday.

Pittsburgh safety Troy Polamalu did not practice Thursday. He is considered a long shot to play Sunday. He hurt his knee in the season opener.