2013: Signed with the Montreal Alouettes on May 27
2013 CFL Draft: RD 4 (32) Montreal Alouettes
2013: Montreal Alouettes
Klassen, who made an impressive ascendancy to the pro ranks, was featured in the rotation on the Alouettes’ defensive line. He recorded his first career CFL sack in his first home-regular season tilt at Percival Molson Stadium. He had his best game of the season recording three defensive tackles against Edmonton on July 25.
He was the third Calgary Dino the Alouettes drafted in May 2012. He led the Dinos with 5.5 sacks lin his last season in the CIS and picked up his first career interception Week 3 against the University of Manitoba.