The regular season is still several weeks away and the Redskins have already been derailed by injuries.
Second-year wide receiver Robert Davis suffered a broken tibia and multiple ligament damage to the outside of his right knee during Saturday's practice, ESPN reported, citing sources.
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He is expected to be placed on injured reserve, the report added.
Davis, who caught three passes for 35 yards in Thursday's preseason opener against the Patriots, sustained the injury during a 7-on-7 drill while jumping for a pass. He is the third Redskins player to be ruled out for the season after the team lost rookie running back Derrius Guice and tight end Manasseh Garner to torn ACLs.
The Redskins will next face the Jets in the second week of the preseason at 8 p.m. ET Thursday.