Tra Thomas has knee surgery

SAN DIEGO -- Random notes from San Diego after a productive three-day stay at Chargers’ camp:

Left tackle Tra Thomas had arthroscopic knee surgery to clean up a minor issue. The team expects him out 7-10 days.

While the issue is minor, it gives Brandyn Dombrowski even a better chance of being the team’s left tackle if Marcus McNeill’s holdout extends into the regular season. Thomas was signed this summer as insurance, but Dombrowski has looked good.

Rookie linebacker Donald Butler was carted off with an ankle injury. It is not known how serious it is. The team hopes he can help on special teams as a rookie.

  • The Chargers practiced red-zone drills Tuesday evening. Quarterback Philip Rivers continued to have as brilliant camp. He connected on some beautiful plays with tight end Antonio Gates and receiver Buster Davis and Malcom Floyd. Monday, San Diego coach Norv Turner said Floyd makes a spectacular catch every day. Tuesday’s edition was a brilliant catch in the corner of the end zone.

  • Rookie running back Ryan Mathews ran hard in red-zone drills. After signing Sunday, he does not look behind in any way.

  • Every time I look, safety Steve Gregory seems to make a big play. He is big part of the team’s nickel and dime packages.