Washington Redskins linebacker Reuben Foster has suffered a likely season-ending torn ACL injury.

NFL.com national insider Ian Rapoport broke the news on May 20.

According to NFL Network's Mike Garafolo (via NFL.com's Jeremy Bergman), Foster sustained the injury during the first day of Redskins organized team activities (OTAs) on Monday.

Foster suffered the injury after getting pushed to the ground during the first day of Redskins OTAs on Monday, per multiple reporters at practice.

Trainers, along with coach Jay Gruden and GM Bruce Allen, tended to the linebacker before he was carted off the field with an air cast on his leg, NFL Network's Mike Garafolo reported.

Gruden told reporters that Foster was going to undergo an MRI Monday.

Gruden said Foster stepped on Redskins guard Tyler Catalina's foot “as he rushed a gap at three-quarters speed,” per ESPN's John Keim.

After he sustained the injury, Foster “pounded the turf with his fists,” per Keim. Reporters could hear him crying. Allen accompanied Foster as he was carted off the field.

While the injury could force Foster to sit out the entire 2019 NFL season, Bergman says, “There is a precedent for a player to return from this type of injury suffered at this time of the year.”

Los Angeles Chargers tight end Hunter Henry tore his ACL during OTAs almost a year ago. He sat out the entire regular season. However, he returned to practice on December 17, 2018. He then took the field for the Chargers' Divisional Round loss to the eventual champions New England Patriots, per NFL.com.

Bergman says Foster could make a similar comeback. However, the former admits, “such a return is rare and unlikely.”

The Redskins were planning to start Foster at inside linebacker (with the other one probably being Shaun Dion Hamilton) this season, per ESPN. Among Foster's potential replacements could be Mason Foster, Cole Holcomb, or Josh Harvey-Clemons.

Reuben Foster's injury is a massive blow to a Redskins team which seeks to improve its 7-9 win-loss record from last season. It's going to be interesting to see how Gruden and Co. make the necessary adjustments moving forward.