Washington (knee) is unlikely to play Week 5 against the Bills, Mark Long of the Associated Press reports.
Washington suffered the injury in Sunday's win over the Falcons, which was the sixth-round rookie's NFL debut, as he filled in for Jamal Agnew (quad), who was inactive. It's unclear if Washington is in danger of missing time beyond that, but Agnew is expected to return for Sunday's Week 5 matchup against the Bills in London.