Mykel Williams says he is ready to play Seattle after a year away

Mykel Williams was a limited participant in Wednesday's practice, the first of three before Sunday's game at Seattle, and he told reporters before it that he wants to play.

"I'm ready to go," Williams said, per David Bonilla of 49ers Webzone. "I miss playing ball. It's been like damn near a year since I played."

• The clock. The 49ers opened his practice window on Sept. 30 (Bonilla, 49ers Webzone, that day). The rule gives them 21 days, so he has to be activated by Oct. 21 or he stays on the physically unable to perform list for the season. Two games fall inside that window: at Seattle on Sunday, Oct. 11, and Washington on Monday, Oct. 19.
• The room he would need. The club's roster page lists 53 active players on Wednesday. Activating Williams takes a release, a trade or an injured reserve move to open a spot.
• What he said about last season. "I wasn't happy with what I did, to be real," he said of a rookie year that ended after nine games with a torn ACL, per Bonilla. Asked whether being leaner makes him quicker, he said, "You gonna see Sunday." That is a forecast, and the inactive list 90 minutes before kickoff will grade it.
• Five did not practice. James Thompson Jr. (ankle), Nick Bosa (calf), Kyle Juszczyk (knee), Marques Sigle (ankle) and Upton Stout (shoulder), per the list Shanahan read before practice, in the transcript the club's communications staff provided.
• Stout. Shanahan called him day to day on Monday with a sprained AC joint. He did not practice Wednesday. The 49ers have two more practices to find out what day to day means.
• Three were limited. Williams, Mike Evans (ribs) and Kaelon Black (illness). Evans had five catches for 76 yards against Denver with the rib injury and had no setback, Bonilla reported.
• The squad. The 49ers signed receiver Xavier Smith to the practice squad and put Dante Pettis on practice squad injured reserve, the club announced at 12:05 p.m. Pettis had signed on Sept. 30. Smith played three games for the Rams this season before they waived him Oct. 2; he has 20 career catches for 309 yards in 34 games, per the release.
• The count. Nick Wagoner of ESPN counts 16 49ers on injured reserve and two on PUP, which matches the club's roster page, and 75 games already missed by injured players, the most in the league after four weeks by his tally.
• Juszczyk's fine. The NFL rescinded the fullback's celebration fine on appeal, ESPN reported Wednesday. He is still expected to miss two to three weeks with the knee, per ESPN's Monday report.

Kickoff Sunday is 1:25 p.m. Pacific on FOX. The first official word on who plays comes with Friday's game statuses.