Cowboys' Asim Richards: Considered unavailable Tuesday

Richards (ankle) was considered a non-participant at the Cowboys' walkthrough Tuesday, Jane Slater of NFL Network reports.

Richards has been unavailable for each of the team's first two walkthroughs of the week, putting his availability for Thursday's contest against the Giants in doubt. He'll look to participate in some capacity Wednesday; otherwise, Matt Waletzko would likely operate as the top reserve option at offensive tackle in Week 13.