This is from ESPN.com
Romo initially was diagnosed with a pinkie sprain in Sunday's 30-24 overtime loss to the Arizona Cardinals. The injury will not require surgery, a member of the Cowboys' medical staff told ESPN.com's Matt Mosley.
Veteran quarterback Brad Johnson, the Cowboys' holder on kicks, is Romo's backup.
The Cowboys have lost two of their last three games after starting the season 3-0. If Romo's absence follows the four-week timeline, he would miss only three games (at St. Louis, home to Tampa Bay, at the New York Giants). Dallas has a bye on Nov. 9, then visits Washington on Nov. 16.