Cowboys quarterback Tony Romo diagnosed with back contusion

Dallas Cowboys quarterback Tony Romo was diagnosed with a back contusion following Monday night's loss to the Washington Redskins, head coach Jason Garrett said. Romo left the game in the third quarter after being kneed in the back by Redskins linebacker Keenan Robinson.

Dallas Cowboys quarterback Tony Romo was diagnosed with a back contusion following Monday night's loss to the Washington Redskins, head coach Jason Garrett told reporters.

Romo left the game in the third quarter after being kneed in the back by Redskins linebacker Keenan Robinson. He was replaced by backup Brandon Weeden before returning to play in the fourth quarter and overtime. He was held to 209 passing yards with one touchdown on 17 of 28 passing, while being sacked a season-high five times as Dallas fell 20-17 in overtime.

The 34-year-old had back surgery last December and was limited during the offseason and training camp. During the Cowboys' 6-2 start to the season, Romo has completed 68.2 percent of his passes for 1,998 yards, 15 touchdowns and six interceptions.

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The Cowboys have improved from No. 16 in yards last season to No. 4 this season. Running back DeMarco Murray has set an NFL record with eight straight 100-yard rushing games to start the season en route to a league-high 1,054 yards.

The Cowboys are in first place in the NFC East and host the Arizona Cardinals on Sunday at 1 p.m. ET.

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- Paul Palladino