Andersen (knee) won't suit up Monday against Las Vegas, Marc Raimondi of ESPN.com reports.
Andersen has been dealing with the knee issue since getting hurt Week 4 versus New Orleans. He's played in just three of Atlanta's nine contests since and has seen his defensive snap count fall after getting off to a strong start to the campaign. With Andersen out again Week 15, Nate Landman could take on a larger portion of defensive snaps.