Hubbard was a sixth-round pick of Cleveland in the 2008 NFL Draft. An exemplary athlete, the 6'2", 225-pound Hubbard has yet to develop receiving skills at this level, having spent time with both Cleveland and Oakland, who released him over the weekend. He spent his rookie season on Cleveland's practice squad, and last year on Oakland's.
Russell (6'3", 278), a rookie, was an undrafted free agent out of Wake Forest. He played defensive tackle in college, and spent time with Green Bay and Kansas City, getting reps at outside linebacker. Known more for his strength, toughness and aggressiveness than any particular skill set, Russell could conceivably play either strong-side linebacker position or defensive end in George Edwards' defensive scheme, with outside linebacker being the most likely possibility.
The Bills now have six of eight practice squad spots occupied. Joique Bell, Rodney Ferguson, Naaman Roosevelt and Jason Watkins were added to the squad on Sunday.