Michael Crabtree, San Francisco's No. 1 wideout, is out until at least November with a torn Achilles tendon. Mario Manningham,Cheap Shoes Uk
, the team's second-leading receiver last season, has yet to practice this summer as he continues to recover from a December knee injury.
With veteran Kyle Williams also coming off a knee injury suffered late last season, Collie is battling not just to make the roster, but also for a possible key role in September's season opener against Green Bay.