It looks like the Cats 2012 draft pick Fredric Plesius's NFL window is closing as he wan't invited to the super regional combine. He might get an invite to a free agent camp, but (fingers crossed) his chances are slowly diminishing on sticking in the NFL. He would be an excellent addition to special teams and I believe he has the size, speed and talent to be a starting linebacker in the CFL with some grooming.
P.S. Matt Sewell wasn't invited either. The only Canadians listed are: Ben D'Agiular, Stefan Charles, Andrew Hamilton RB (McGill) and Victor Marshall TE (UBC).
Here's the site with the combine invitees: