Tra Thomas Retires After 12 Seasons
"I was just watching film and I don't think I was playing as well in practice as I should be," Thomas told ESPN.com's Bill Williamson. "If I'm not playing well in practice, I'm not going to play up to my standard in a game ... I feel very good about the decision. I 'm going out on my own terms. At least, I know I gave it everything I could."
Thomas was a mainstay on the Eagles' offensive line from 1998-2008 -- over that span, he started 168 games. Thomas moved on to Jacksonville last season, where he started three games and played in eight.
Thomas, a 1998 first-round pick out of Florida State, made three Pro Bowls (2001, 2002 and 2004) and was an All-Pro selection in 2002.
In McNeill's absence, the Chargers were hoping that Thomas could help add some stability at left tackle. However, San Diego will likely turn that spot over to Brandyn Dombrowski, who started eight games in 2009, his rookie season.