Collie, who will wear No. 10 for the team, was spotted at Thursday’s practice during the media availability, though the team has not yet officially announced the move.
The veteran wide receiver spent training camp with the 49ers before being released during the team’s final cut downs. He has worked out for other teams since that time, but will now have a chance to contribute in New England, where four of the team’s six wide receivers were on Wednesday’s injury report.
Source: Field Yates, ESPNBoston.com