The San Francisco 49ers on Thursday had a couple of concerning updates to their Week 10 injury report.

New additions to the practice participation report for Thursday's session included linebacker Dre Greenlaw and left tackle Trent Williams. Both were listed as limited participants.

Greenlaw is dealing with a knee issue while Williams is nursing a shoulder ailment despite both being absent from Wednesday's practice for their typical veteran rest days per ESPN's Nick Wagoner. Neither player was given any injury designation Wednesday. It's unclear whether they were set for full practices and got hurt during the session or if they were dealing with something before practice and the team decided to limit their participation.

Friday the official status report for Sunday's game will come out, but both players are extremely important at their respective positions. Rookie Jaden Dugger would take over for Greenlaw if the veteran LB is out. If Williams is absent the team would probably lean on Vederian Lowe to take the left tackle snaps.

Here's the full Thursday participation report:

Did not participate

• WR Mike Evans (Achilles)

• CB Renardo Green (back)

• CB Deommodore Lenoir (foot)

Limited participation

• LB Dre Greenlaw (knee)

• DB Siran Neal (knee, foot)

• WR Deebo Samuel (hamstring)

• CB Upton Stout (shoulder, neck)

• DL CJ West (knee)

• LT Trent Williams (shoulder)

Full participation

• CB Nate Hobbs (adductor)

• WR Demarcus Robinson (ankle)