Trent Williams (shoulder) is questionable to play in Week 10 against the Cowboys.

Williams evidently injured his shoulder during the 49ers’ practice on Thursday, as did LB Dre Greenlaw (knee). 49ers OT Vederian Lowe would be Williams’ replacement if he cannot play. 49ers starting perimeter CBs Renardo Green (back) and Deommodore Lenoir (foot), and slot DB Upton Stout (shoulder) are also questionable.