Williams sustained his injury in Week 17 against the Chicago Bears. He was forced to leave the game after tweaking his hamstring and was unable to return. The 37-year-old missed practice in the build-up to the Seahawks game and was ultimately forced to sit out.

The San Francisco 49ers sorely missed two of their offensive stars in Week 18, and their playoff return is still up in the air.

San Francisco 49ers left tackle Trent Williams was seen in uniform at the start of Thursday's practice. The All-Pro sat out Wednesday as he's been dealing with a hamstring injury suffered in Week 17. Williams usually rests on the first day of practice during a game week, but head coach Kyle Shanahan clarified this wasn't the case.

Take a look at players who have been ruled out for the San Francisco 49ers Week 18 Saturday night matchup versus the Seattle Seahawks.

Starting left tackle Trent Williams hasn't been ruled out for Saturday's game, but he didn't practice this week on his injured hamstring.