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Cowboys running back DeMarco Murray was out of commission because of an illness on Christmas, but he was back to work on Boxing Day.

Murray participated in practice on Friday and drew a probable tag on the injury report, leaving him in line to play against Washington in the regular season finale. The Cowboys have locked up the NFC East title and will likely wind up as the third seed, but they can grab a first-round bye with the right combination of results.

Owner Jerry Jones said Friday on 105.3 The Fan that the possibility was enough for the Cowboys to go all out with Murray and everyone else healthy enough to play.

“It would be a catastrophe if we walked up there and, for whatever the reason, of our own volition, of our own decision making, pulled back a little bit and then had a chance to get that first-round bye,” Jones said, via the team’s website.

Assuming Jason Garrett sticks to the plan laid out by the guy signing the checks, Murray should end Sunday as the Cowboys’ new leader in single-season rushing yards. He’s 29 yards behind Emmitt Smith, who ran for 1,773 yards in 1995.

Right tackle Doug Free is doubtful to play with the ankle injury that kept him out last week. Jermey Parnell will likely start again.