What happened: Dallas safety Jalen Thompson injured his hamstring in Sunday's loss to Baltimore. Executive vice president Stephen Jones said Thompson will miss four-plus weeks.

Why it matters: Dallas already has P.J. Locke on injured reserve while Malik Hooker recovers from a fractured forearm. Jones said the club will look for a way to shore up the safety spot while Thompson and Locke rehab.

What to watch: Watch Hooker's availability this week and any roster move to add safety depth.