Tra Thomas, signed by the Chargers in June to provide d...

Tra Thomas, signed by the Chargers in June to provide depth at left tackle due to the protracted absence of Marcus McNeill, has retired.

The team is expected to announce the move at tonight's preseason game against the Dallas Cowboys.

Brandyn Dombrowski will start tonight and play a half before likely giving way to Ryan Otterson, an undrafted rookie out of Wyoming.

The Chargers will make Tyronne Green the backup, but Green hurt his ankle in practice this week and will not play tonight.

Dombrowski has played parts of three games at left tackle but has seven career starts at right tackle and two at right guard. Green, drafted as a guard in 2009, just began playing right tackle in July, moved to left tackle two weeks ago and played about 20 snaps there in last Saturday's preseason opener.

Thomas, a 12-year-veteran, had arthroscopic knee surgery early in training camp and returned to practice just this week. While he was working with the second team, it was becoming apparent that Green would surpass him on the depth chart.

McNeill, a two-time Pro Bowler, is staying away from the Chargers over dissatisfaction with his contract offer -- a $3.168 million tender that was reduced to $630,000 and as of Friday night was reduced to at least $595,000.

The Chargers will likely look to add an experienced tackle, either when teams make their cuts in early September or via trade.

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