The team reported on its website Tuesday night that Kitna would join the team in time for practice Christmas Day. The move is pending a physical for the 41-year-old Kitna, who retired after the 2011 season.
Romo injured his back in a 24-23 win over Washington that set up the Cowboys for their third straight playoffs-or-bust finale against an NFC East rival.
The Cowboys say Romo is getting treatment and being evaluated daily. Kyle Orton is the backup.
The 41-year-old Kitna has been teaching and coaching at Tacoma's Lincoln High School.
Kitna is a graduate of the school who was hired as a math teacher after his 15-year career as an NFL quarterback, which included two years as starting quarterback for Seahawks.