Lee, 24, was recruited to the Bombers as a mature aged rookie and is now available to play against North Melbourne at Etihad Stadium on Sunday.
“We are pleased to confirm the promotion of Brendan to the club’s senior list,” Hamilton said.
“Brendan has been one of the most consistent performers in the VFL and when he gets his opportunity we are confident he can have an immediate impact on the team.""
Lee won East Perth's best and fairest and finished fourth in the Sandover Medal, racking up 500 possessions in the WAFL last year. the dashing midfielder boasts a big engine and wins a good mix of inside and outside ball.
He has enjoyed a consistent season with Essendon's VFL affiliate side, Bendigo Gold.
Watch this Sunday afternoon's match against North Melbourne from the comfort of a corporate suite.