SANTA CLARA — Quarterback Brock Purdy is scheduled for limited practice on Wednesday as the 49ers return to work after a disastrous game in Green Bay. Purdy, who sustained a right shoulder injury in the 49ers' game Nov. 17 against the Seattle Seahawks, was inactive for the team's 38-10 loss to the Packers. Purdy had two MRI examinations last week, with the second scan coming after his shoulder did not improve as expected. There was no structural damage revealed. Shanahan said the level of Purdy's on-field participation on Wednesday will be determined by how the early portion of practice goes. The 49ers officially opened the practice window for linebacker Dre Greenlaw, who sustained a torn Achilles tendon in the Super Bowl. Greenlaw is scheduled for limited practice and will not play Sunday against the Buffalo Bills. Left tackle Trent Williams (ankle) and defensive end Nick Bosa (hip/oblique) are out of practice on Wednesday. It remains to be seen whether they will play on Sunday. Left guard Aaron Banks and defensive tackle Jordan Elliott remain in the NFL's concussion protocol after sustaining injuries in the 49ers' 38-10 loss to the Green Bay Packers on Sunday. Cornerback...
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