America's Team now must turn to Brandon Weeden under center in hopes of remaining atop the NFC East, with former Boise State quarterback Kellen Moore temporarily filling the backup role. Needing insurance, the Cowboys acquired veteran Matt Cassel in a trade with the Buffalo Bills on Tuesday.
Romo will be eligible to return from injured reserve in Week 11 against the Miami Dolphins. Until then, it might be a wild ride for the NFL's glamour franchise. What better opportunity to discuss the franchise's finest clipboard carriers and scout team signal-callers?
Here's one writer's ranking of the top 10 backup quarterbacks in Cowboys history:
10. Randall Cunningham, Bernie Kosar and Rodney Peete
This trio of notables begins our rankings with an unavoidable tie. Cunningham, Kosar and Peete started a combined 325 games for other teams. They started a total of five for the Cowboys.
9. Clint Longley
Longley is best known for stepping in for the injured Roger Staubach and rallying the Cowboys to a 24-23 victory over Washington on Thanksgiving Day in 1974. He also infamously brawled with Staubach at training camp in 1976. He started two NFL games during his career -- one for Dallas and one for the San Diego Chargers -- winning both.
8. Wade Wilson
Wilson enjoyed a 19-year playing career, including three seasons as caddie for Troy Aikman in the 1990s. Wilson has served two tours as the Cowboys' quarterbacks coach, first under Dave Campo, and his current tenure with Jason Garrett. Presumably, if anything happens to Weeden, Cassel and Moore, he could put down the headset and take the field at age 56. However, that's probably not an ideal scenario for the club.
7. Brad Johnson
Anytime you have a backup with more Super Bowl rings than the starter, he makes the list.
6. Eddie LeBaron
LeBaron -- all 5-foot-7 and 160 pounds of him -- was the Cowboys' primary starting QB during the franchise's woeful first two seasons. He went a combined 2-17-1 in 1960 and '61 before settling in as backup to Don Meredith. After his playing days, LeBaron practiced law and worked in the front office of the Atlanta Falcons. He died earlier this year at age 85.
5. Jon Kitna
Kitna humbly backed up Romo from 2009-11 after being a starter with the Seattle Seahawks, Cincinnati Bengals, Detroit Lions and Barcelona Dragons. Already retired from football in 2013, he briefly left his job as a math teacher to suit up for one game with the Cowboys when Romo suffered a back injury. He's now earning nearly six figures as the head football coach at Waxahachie High School south of Dallas.
4. Gary Hogeboom
Hogeboom joined the Cowboys as backup to Danny White in 1980 following the retirement of Staubach. At one point, Hogeboom replaced White as starter in 1984, but coach Tom Landry eventually reversed course. Hogeboom appeared as a contestant on "Survivor: Guatemala" in 2005.
3. Craig Morton
After backing up Meredith for four seasons, Morton became the starter in 1969 and guided the team to Super Bowl V the following season. He ceded the starting role to Staubach in 1973 and was traded to the New York Giants a year later. In an ironic twist, Morton quarterbacked the Denver Broncos in Super Bowl XII against the Cowboys. The Dallas defense harassed him badly, forcing four interceptions, in beating the Broncos 27-10.
2. Jason Garrett
The current Cowboys head coach went undrafted out of Princeton and bounced from the New Orleans Saints to the World League to the CFL before landing with Dallas in 1993. He memorably led Dallas to a 42-31 victory in a spot start against the Green Bay Packers on Thanksgiving Day in 1994. Garrett filled the third-string QB role for most of his time as a Cowboy, graduating to the backup role in Troy Aikman's final two seasons.
1. Danny White
White patiently bided his time behind Staubach for four seasons, getting his work in as Dallas' primary punter. After Staubach's retirement, White led the Cowboys to the NFC Championship Game in each of his first three seasons as starter. He lost, then regained the starting job from Hogeboom and remained with Dallas through the 1988 season. After his playing career, White became a longtime coach in the Arena Football League.
Also receiving votes: Steve Beuerlein, Drew Bledsoe, Glenn Carano, Babe Laufenberg, Stephen McGee, Kyle Orton, Steve Pelluer, Tony Romo, Clint Stoerner, Kevin Sweeney, Steve Walsh, Brandon Weeden.