Butler was with the Cowboys the last two seasons, but was cut by the club during this year's training camp. Much of the preseason he was hampered by a hamstring injury.
Butler had been on the New Orleans Saints roster the last three weeks, so under league rules the Cowboys will have to keep him on the 53-man NFL active roster. After three weeks, the Cowboys can release him and try to resign him to their practice squad.
After a All-Mountain West Conference senior season in 2005, Butler signed a practice squad contract with the Cowboys in 2006. He has appeared in one NFL game in his career.
Butler is expected to regain his old Cowboys number 36.