IRVING, Texas - The already slumping Dallas Cowboys now must survive a few games without two-time Pro Bowl quarterback Tony Romo, who has a broken finger on his throwing hand.

There was indeed something wrong when Romo badly missed on his last two pass attempts to Terrell Owens in a 30-24 overtime loss at Arizona on Sunday, the Cowboys' second defeat in three games. Coach Wade Phillips said Monday that Romo broke his right pinkie on the first play of OT.

Brad Johnson, the 40-year-old backup whose last start was in 2006 for Minnesota, takes over Sunday when Dallas plays at St. Louis.

“Obviously, it's unfortunate for Tony to have to go through something like this. He'll recover quick; he has a great attitude about it,” Johnson said. “At this time, it's really just important for the offense especially to just kind of catch on to my snap count and the way we manage the huddle. ... I'm excited about the opportunity, worked hard to get here.”

Johnson, who came to Dallas last year, won a Super Bowl with Tampa Bay during the 2002 season and is the only Cowboys player with a championship ring.

Phillips said Romo won't need surgery, and the timing of his return “depends on how fast that heals.” The Cowboys have three games before an open date Nov. 9.

Romo wasn't in the locker room Monday when it was open to reporters, but Johnson described Romo as being in good spirits.

The Cowboys scored 10 points in the final 2 minutes of regulation Sunday. They got the ball to open overtime, but Romo fumbled and had two incompletions. He started flexing his hand after recovering his fumble.

Then Arizona blocked the punt and recovered it for a game-ending touchdown - a play that also cost Dallas its punter, Mat McBriar.