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...

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