Washington waived him on Monday to make room for DE Frank Kearse, who was re-signed.
There was some speculation that the Falcons could place a waiver claim for Amerson, given that they have Raheem Morris, who has been a supporter of Amerson in the past, on their coaching staff, but the Raiders had the priority over them anyways.
Amerson, 23, is a former second round pick of the Redskins back in 2013. He has two years remaining on his four-year, $3.85 million rookie contract and stands to make base salaries of $705,082 and $880,123 over the next two years.
This season, Amerson has appeared in two games and recorded two tackles and a pass defense for Washington.