Weeden, 31, is entering the final year of his contract. Last season, he passed for 303 yards with three touchdowns and two interceptions while filling in for Romo when he was sidelined with two transverse process fractures.
"You're always trying to upgrade your football team," Garrett said. "Obviously, we feel really good about Tony. He had an outstanding year for us last year. Brandon did a really nice job in his opportunities. If you look at what he did -- he played in (four) games, (three) he came in relief for us and the one game he started we didn't play our best game on offense. But it was against a really good defensive team in Arizona. We still feel like he's a young player who needs to play more. He's really growing before our eyes.
"We like what Dustin Vaughn did in the preseason. He is a smart kid. He is really conscientious. He wants to be a good football player and works very hard at it. He's one of those guys, too, a young player and you can see him get better with every rep that he gets. He is going about it the right way. We think he's got a future."
Free was listed as doubtful to play in the first-round playoff game. Linebacker Anthony Hitchens (ankle) and defensive end Tyrone Crawford (illness) are both active after being listed as questionable. The Cowboys will have all nine players listed as probable available Sunday.
Dallas is a 6-point favorite at home against Detroit in the first-round playoff matchup.
Starting right tackle
According to NFL Network, Free has a stress fracture in his foot.
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