The Cowboys reported on their website Friday that Dunbar will have surgery for an injury to the joint in his left knee.
Dunbar got hurt Thursday after rushing for a career-high 82 yards. Starter DeMarco Murray ran for three touchdowns in the Cowboys' 31-21 win over the Raiders.
Dunbar showed flashes of potential but battled injuries all season. He was an undrafted free agent last year.
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- Lance Dunbar