What happened: Chicago placed defensive tackle Kentavius Street on injured reserve Wednesday following a knee injury suffered in Monday's 34-17 win at Seattle. The team signed tight end Stephen Carlson to the active roster from the practice squad in a corresponding move.

Why it matters: Street's absence sidelines him for at least four games, testing a front already managing thin defensive tackle depth. Carlson provides tight end depth and blocking experience in his fourth NFL season.

What to watch: Chicago must reshuffle its interior defensive line rotation while Street serves the mandatory four-game minimum on injured reserve.