Redskins' head coach Jay Gruden originally said that Allen would miss 3-4 weeks. That prognosis shifted Wednesday when Dr. Robert Anderson informed the team that Allen will miss the rest of the 2017-2018 season, effectively ending his rookie campaign. The rookie suffered the sprain during the Redskins 26-24 win over San Francisco last Sunday.
"We got better news after the surgery that it wouldn't be as lengthy as some of these typically are, "Gruden said. Hopefully we see him again, but it's up to the rehab".
By placing Allen on injured reserve, Washington clears a spot on its roster for another player.
Through six games Allen was proving to be a disruptive force on the defensive front with three sacks, two quarterback hits, and eight hurries.
Regardless, Allen's extended loss is a blow to the defensive line.
Allen was a first round pick by the Redskins this year.
Each NFL team is allowed to bring up to two players back from injured reserve to its active roster each season.
"He creates havoc. It goes without saying that to not have him for a while like that is pretty big", cornerback Josh Norman said, via the Washington Post. Second-year pro Anthony Lanier II is expected to get the start with him on the sidelines.