ARLINGTON, Texas -- Tony Romo has a chance to start for the Dallas Cowboys longer than Roger Staubach or Troy Aikman. The question is whether he will ever match their Super Bowl pedigrees.
Romo and the Cowboys agreed to a six-year contract extension worth $108 million Friday, with about half of that guaranteed to make him the highest-paid player in franchise history.
The agreement, reported on the team's website, will lower the quarterback's salary cap number for 2013 by about $5 million, giving the team more room to sign free agents and draft picks.
Romo, who turns 33 next month and was entering the final year of his contract, gets $55 million guaranteed.
Super Bowl winner Joe Flacco got $52 million guaranteed in the six-year, $120.6 million contract he signed with Baltimore earlier this month.
Romo could be with Dallas through 2019, giving him a chance to be the starter longer than the 11 seasons of Aikman and seven of Staubach, who was a part-time starter his first four years with the Cowboys.
Aikman and Staubach won five Super Bowls between them, while Romo has just one playoff win in six full seasons as the starter. He had a gut-wrenching playoff loss the year he took over midseason in 2006, flubbing the hold after driving the Cowboys into position for the go-ahead field goal in the final minutes.
Romo also lost playoff-or-bust games in regular-season finales the past two years. That included a loss to Washington last season when Romo threw an interception with a chance to tie or win the game with a drive in the final 3 minutes.
A former Romo rival, Donovan McNabb, questioned the deal on Twitter.
Wow really, with one playoff win, McNabb wrote. You got to be kidding me.
Dez Bryant, who teamed with Romo for career highs of 1,382 receiving yards and 12 touchdowns in 2012, tweeted, Congrats Big Tony on the contract extension.
Romo is the franchise leader in touchdown passes and the single-season leader in touchdowns, passing yards, completions and attempts. He had a career-high 4,903 passing yards in 2012 but matched his highest interception total at 19 and had his lowest quarterback rating at 90.5 rating.
His best rating of 102.5 came in 2011, when the Cowboys lost to the New York Giants with a playoff berth on the line in the finale. His other best season was 2009, which included his only playoff win against Philadelphia.