Cowboys G Marco Rivera, 34, is expected to announce his retirement after a second back surgery in January. Rivera spoke earlier in the offseason about making a comeback, but that apparently won't happen. Packers GM Ted Thompson was vilified two years ago for not paying huge bucks to retain Rivera, but he turned into a major mistake by the Cowboys. Mar. 29 - 10:28 am et Source: Fort Worth Star-Telegram He hurt his back before he ever got to us and was never the same player. I'm almost glad to see him go, he got pushed into the backfield on almost every play.