Pair of 49ers stars suddenly questionable for Cowboys game after practice injuries

Trent Williams and Dre Greenlaw are questionable for San Francisco’s Sunday game against Dallas after both were injured in Thursday’s practice. Their possible absence matters because Williams anchors the offensive line and Greenlaw is a key linebacker, though coach Kyle Shanahan did not clarify whether either will play.

Williams missed Friday’s practice with a shoulder injury, while Greenlaw took part on a limited basis with a knee injury. The 38-year-old Williams has played every competitive snap this season; if unavailable, Vederian Lowe is the likely replacement, with Enrique Cruz also in reserve. Dallas has recorded 12 sacks in its past four games, while rookie Jaden Dugger could cover for Greenlaw after impressing in previous opportunities.