 He spent 2 seasons with the Lions receiving additional playing time in his second season with the club.Knowlton was traded on April 29, 2008 from BC Lions to the Hamilton Tiger-Cats along with kicker Ara Tchobanian in exchange for the 9th overall selection in the 2008 CFL Draft.In both the 2008 and 2009 CFL seasons Knowlton amassed more than 90 tackles.