"We don't think it's serious," coach Rick Carlisle said. "It's next man up."
The next man will not be Raymond Felton. The former Knicks guard, who has yet to make his Dallas debut, aggravated the right ankle that kept him out from Oct. 10 until he recently served his four-game suspension. Felton was a healthy scratch for Monday's loss to the Indiana Pacers.
Nelson, who is averaging 7.6 points and 4.6 assists, had started all 15 games this season. Devin Harris and J.J. Barea are the two healthy point guards remaining on the Mavs' roster.