Lauvao (knee) suffered a torn ACL during Sunday's loss to the Falcons, John Keim of ESPN.com reports.
Lauvao will require season-ending surgery to address his torn ACL, and is expected to be placed on injured reserve. With fellow guard Brandon Scherff (pectoral) also having suffered a season-ending injury during the Week 9 contest, the Redskins will to address the absence of both starting linemen. Casey Dunn is expected to enter the starting lineup at either guard position.