NFL Network's Mike Garafolo reported that Foster was carted off the field Monday early in the team's OTA session. Foster was in tears, sobbing as he was driven back to the team facility and an air cast was placed on the injured leg, per Garafolo.
Foster appeared to injure his left leg after getting pushed to the ground, 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.
"He's going to get his MRI and all the tests he has to do," Gruden told reporters Monday afternoon. "We don't have any information right now. He just ran through a gap, stepped on [Tyler] Catalina's foot and then landed funny on his left leg and we're getting it checked out now."
Washington planned to slide Foster into the middle of an underrated defense. Depending on the severity of Monday's injury, those plans could be on hold.
UPDATE: Foster is believed to have suffered a torn ACL, NFL Network Insider Ian Rapoport reported, per sources. Rapoport added the injury is considered "major and significant." The linebacker will see specialists to determine the full extent of the injury.