Greenwood was drafted by the Toronto Argonauts in the first round of the 2010 CFL Draft but spent three seasons in the NFL with the Kansas City Chiefs where he recorded 34 defensive tackles in 48 career games.
Greenwood signed with the Argos in 2014 and played in 22 games starting in 20 of them and recorded 103 defensive tackles.
Greenwood played 12 games last season and recorded 70 defensive tackles, two quarterback sacks, and one forced fumble.
The signing may give the Eskimos some ratio flexibility as Greenwood would likely challenge for the starting linebacker spot left by Deon Lacey who signed with the Miami Dolphins. The move would allow the Eskimos to have three American starting receivers.
In other news quarterback Jordan Lynch has announced his retirement after two seasons with the Eskimos. The product out of Northern Illinois signed with the Eskimos in 2015 and scored five rushing touchdowns in two seasons. Lynch scored the winning touchdown in the 2015 Grey Cup game. Lynch has agreed to be the running backs coach for Northern Illinois University.