Purdy (shoulder) isn't participating at the start of practice Friday afternoon, Cam Inman of The San Jose Mercury News reports.

Brock Purdy - Not spotted at practice

Brock Purdy (shoulder) undergoes MRI that comes back clean

GM John Lynch said Friday morning that the 49ers feel good about Purdy's right shoulder after seeing results from an MRI, but Lynch acknowledged the quarterback's status is "tenuous" for Sunday at Green Bay, Cam Inman of the San Jose Mercury News reports.

Brock Purdy - Uncertain despite encouraging MRI

Nick Bosa "Questionable At Best" For Week 12

San Francisco 49ers face Green Bay Packers with George Kittle's return amid close-game struggles

49ers drop to 5-5 amid injuries to Brandon Aiyuk and Trent Williams; Christian McCaffrey and George Kittle stay key

Deebo Samuel faces criticism from Terrell Owens amid on-field altercations and underperformance

Williams (ankle) missed practice for the second day in a row Thursday, Eric Branch of the San Francisco Chronicle reports.

Trent Williams - Sits out of practice again

Bosa (hip) did not participate in Thursday's practice, Eric Branch of the San Francisco Chronicle reports.

Nick Bosa - Misses practice again

Cowing (concussion) did not participate in practice Thursday.

Jacob Cowing - Misses practice Thursday

Nick Bosa (hip) does not practice Thursday

Brock Purdy (shoulder) limited in practice Thursday

George Kittle (hamstring) limited in practice Thursday

Christian McCaffrey (Achilles) limited in practice Thursday

Nick Bosa, Trent Williams Missing From Thursday's Practice