Allen (hamstring) is active for Sunday's game against the Chiefs, Aric DiLalla of the Broncos' official site reports.
Allen injured his hamstring in Week 7 against the Cardinals, but he's been given the green light to play Sunday after having his reps limited during Week 8 prep. He has 24 tackles (10 solo), including 4.5 sacks, two pass defenses and one forced fumble through seven regular-season games.