DeMarco Murray has been unhappy with the game management of Tony Romo this season.
"DeMarco Murray, their star running back, grumbled to teammates about not getting the ball enough," Rapoport said Sunday morning before Week 16. "He doesn't understand why Romo always seems to choose pass instead of run. ... The relationship between Romo and Murray is frosty, a little bit of a growing rift there. It's surprising that some pettiness should creep in at a crucial point of the season, but that's what's happening."
Murray ranks 17th in rushes per game with 14.8.
"When you talk to people who know Bill Callahan, the play caller, they say he's a run-first play caller," Rapoport said. "But it hasn't always turned out like that."