ARLINGTON, TX - JANUARY 03: Tony Romo #9 of the Dallas Cowboys sits on the bench late in the fourth quarter as the Washington Redskins beat the Dallas Cowboys 34-23 at AT&T Stadium on January 3, 2016 in Arlington, Texas. (Photo by Tom Pennington/Getty Images)

Report: Cowboys have already made a decision on who the QB will be when Tony Romo is healthy

Dak Prescott has filled in nicely, but this is still Tony Romo's team.

Rookie Dak Prescott has been a nice surprise filling in the injured Tony Romo. His stellar play—-he's led the Cowboys to a 4-1 record and has yet to throw a pick—-would seem to have ignited a quarterback controversy.

But not so, according to unnamed sources close to the situation, who say the team has every intention of handing the reins to Romo as soon as he returns from a back injury.

Jason La Canfora of CBS Sports reports that there's "zero chance" that Romo does not reclaim the start at quarterback once he's cleared to play by team doctors. He explains:

"One source asserted that there is 'zero chance' that Romo does not start when cleared, pointing to the commitment owner Jerry Jones has made to the veteran quarterback and the bond between the two. The Cowboys' brass believes it will have a more robust, well-rounded offense with Romo back under center, and that he is best positioned to cull the maximum production out of their array of weapons in the passing game."

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While Prescott has been steady and mistake-free, he hasn't exactly been lighting it up. Of his 131 passing attempts on the season, just seven had traveled 20 or more yards through the air before Sunday's tilt with the Cincinnati Bengals. That was last among NFL quarterbacks who've started 4 games.

In five games, Prescott has thrown just four touchdown passes with one turnover (a fumble).

Dallas coaches believe throwing the ball down the field is one area where Romo would be more valuable than Prescott. And with both Romo and top vertical threat Dez Bryant due to return to the lineup in week 8, it's a part of the offense that could have a huge impact once the season progresses into its later stages.