The Commanders placed Allen (pectoral) on injured reserve Wednesday.
Head coach Dan Quinn confirmed Monday that Allen tore his left pectoral in Sunday's 30-23 loss to the Ravens, Adam Schefter of ESPN reports.
The pectoral injury that Allen sustained during Sunday's game at Baltimore may require season-ending surgery, Tom Pelissero of NFL Network reports.
Allen has been ruled out for the remainder of Sunday's game against the Ravens due to a pectoral injury, Nicki Jhabvala of The Washington Post reports.
Allen tallied five tackles (four solo), including 1.0 sacks, during Sunday's 42-14 win over the Cardinals.
Allen (knee) is a full participant at Washington's organized team activities, Zach Selby of the team's official website reports.
Allen (knee) finished 2023 with 53 tackles (30 solo), 5.5 sacks and one pass defense in 16 games.
Allen (knee) has been ruled out ahead of Sunday's game against the Cowboys, John Keim of ESPN.com reports.
Allen (knee) did not participate at practice Wednesday, John Keim of ESPN.com reports.
Allen logged five total tackles (three solo) in Sunday's 27-10 loss to the 49ers.