Collie was on the practice field for Thursday's full-pads workout, which could mean that the Patriots have or will designate Wilfork to the IR. Collie was wearing jersey No. 10.
Collie has spent four seasons in the NFL, all with Indianapolis. He's had a series of concussions that has caused him to miss games, and he only played in one game last season for the Colts before injuring his knee. He signed with the 49ers in August, but was released later in the month. Collie was productive when healthy, catching 12 touchdown passes and 173 passes while with Indianapolis.
He would provide depth at the receiver position for the Patriots. Danny Amendola has missed the last three games with a groin injury, Matthew Slater has missed the last two with a broken wrist, and both Aaron Dobson and Kenbrell Thompkins were listed on Wednesday's injury report. That left Julian Edelman and Josh Boyce as the only healthy receivers.
In addition to Wilfork and Slater, running back Stevan Ridley was the other player not spotted at practice. The Patriots said Ridley missed on Wednesday because of a knee injury.
Globe reporter Ben Volin contributed to this report