Tra Thomas, the last Eagles first-round pick before the Andy Reid era began, has announced his retirement.
Thomas, 35, had knee surgery Aug. 3 with the San Diego Chargers and had only returned to practice this week. Thomas signed with the Chargers as a potential replacement for Marcus McNeill, who continues his holdout.
"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. "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 said he could have gotten through the season, but felt that was the wrong thing to do.
"I could have milked it for a year," Thomas said. "But I have too much respect for the game to do that."
Thomas appeared in eight games with three starts last season as a member of the Jacksonville Jaguars after the Eagles chose not to re-sign him.
He played 11 seasons with the Eagles, playing in fewer than 15 games in a season only once. He went to three Pro Bowls, five NFC title games and a Super Bowl.
His 166 games played ranks fifth in team history, only Brian Dawkins, Harold Carmichael, David Akers and Chuck Bednarik have played more.