The 49ers remain interested in former Colt Austin Collie, but they are unlikely to make a move on the free-agent wide receiver until after training camp begins, a source close to the situation said this week. One of the team's top priorities this summer will be to see if any of their young and inexperienced wideouts perform well enough to warrant significant snaps when the regular season begins. If none elevates his game, an inexpensive veteran like Collie would be of interest.

Collie, who played at Oak Ridge High outside of Sacramento, worked out for coaches and scouts on June 13. He has recovered from a torn pattela tendon that cost him most of the 2012 season in Indianapolis, and he has passed all the neurological tests associated with concussions. Collie has suffered three of them since entering the NFL in 2009. One of the 49ers team doctors, Daniel Garza, is a specialist at Stanford Hospital in concussions and head injuries.

Collie, who played at BYU, has been training in Utah this offseason. He also has had a workout with the Patriots.

Wide receiver, meanwhile, became the 49ers' biggest offseason question mark when Michael Crabtree suffered a complete tear of his right Achilles' heel on May 21. The team's leading receiver a year ago - and the first 49ers wideout to surpass 1,000 receiving yards since Terrell Owens in 2003 - Crabtree will miss at least the first three months of the season.