Williams (leg) has been participating in the 49ers' offseason program and should be ready for training camp, CSN Bay Area reports.

Williams suffered a fracture in his left leg that ended his season prematurely last year. He has recovered well in the offseason and will compete for the 49ers' starting nose tackle position during training camp.

Williams (fractured left lower leg) has been placed on IR by the 49ers, csnbayarea.com reports.

In a corresponding move, the 49ers activated Glenn Dorsey on Monday in order to help boost the team's depth at nose tackle.

Williams (leg) is out for Sunday's game against the Giants.

Williams' absence could leave San Francisco a bit more vulnerable against the run, but he's generally not a high-impact player and certainly not an IDP consideration.

Williams suffered a leg injury late in the second quarter of Sunday's win over the Saints, csnbayarea.com reports.

According to coach Jim Harbaugh, it "looks like (Williams) may have a small fracture. A little above the ankle." With the nose tackle likely slated to miss some time, Quinton Dial figures to be in line for added work in the 49ers' defense in the coming weeks.

Williams led all 49ers with six tackles (all solo) in Monday's win over the Rams.

Williams put together a strong performance from a position - nose tackle - that usually doesn't produce many tackles. He showed great conditioning on a play where he chased down the speedy Tavon Austin on a reverse end-around. Williams appears to be completely over the ankle injury that plagued him early in the year and will see the majority of snaps at nose tackle going forward.

Williams recorded five tackles and also swatted a pass in Sunday's loss to the Cardinals.

Williams had his best game of the season Sunday. He doesn't generate much of a pass rush as the nose tackle in a 3-4 defense, but he should get his share of tackles now that he is fully healthy.

Williams (ankle) was removed from the PUP list on Tuesday, the Baltimore Sun reports.

Williams missed nearly an entire year after breaking his ankle last September, but he's finally ready to return to full contact. He'll likely require some time to work back into game shape but should compete for the starting spot with Glenn Dorsey (biceps) out for the season.

Williams (ankle) may still be a while away from returning, ESPN's Bill Williamson reports.

Williams opened 2013 as the 49ers' starting nose tackle, but then suffered a season-ending broken ankle in mid-September. He was replaced by former first-round draft pick Glenn Dorsey (torn biceps), who filled in admirably but is now out for the 2014 season. With Dorsey out and Williams' status uncertain, 2013 fifth-round draft pick Quinton Dial figures to take the first-ream reps at nose tackle in training camp.

49ers NT Ian Williams (ankle) expects to come off the PUP list at some point in training camp.

Williams has underwent four surgeries on his ankle since last Week 2. He was placed on active/PUP Friday, and can be activated at any time. Williams can't afford any setbacks if he wants avoid missing extended time. He remains a candidate for the reserve/PUP list, which would cost him the first six games.

49ers placed NT Ian Williams (ankle) on the active/PUP list.

Williams is five months removed from his latest ankle surgery. He was always a long shot to be ready for training camp and isn't a lock to get cleared for Week 1. When healthy, Williams will compete for a rotational role behind Glenn Dorsey.

49ers NT Ian Williams (broken leg) underwent another operation in February, and "hopes" to be ready for training camp.

According to beat writer Matt Maiocco, Williams has now undergone four operations since going down last Week 2. The former undrafted free agent will fight for a role as a rotational run stuffer if he's healthy for camp.

49ers NT Ian Williams (broken ankle) expects to be 100 percent for the start of 2014 training camp.

Williams fractured the ankle in Week 2 after making his first career NFL start. Glenn Dorsey took over at nose tackle from there and performed admirably, especially in run defense. 24 years old and signed cheaply through 2015, Williams is likely to return as a rotational run stuffer, playing on early downs.

49ers placed NT Ian Williams on injured reserve with a broken ankle, ending his season.

Making his first career start, Williams was lost for the year in Sunday's blowout loss to the Seahawks. He'll be replaced for former Chiefs first-round pick Glenn Dorsey, who played well in Seattle. It's not a major loss for the 49ers.

49ers NT Ian Williams (broken ankle) is undergoing surgery Monday, and is out for the season.

Coach Jim Harbaugh made the announcement in Monday's presser. Making his first career start, Williams was injured on a cut block in Sunday's loss. He'll be replaced by former Chiefs bust Glenn Dorsey. At least according to Pro Football Focus' ratings, Dorsey played well in Williams' absence.

49ers NT Ian Williams left Sunday night's game with a broken ankle.

49ers NT Ian Williams exited Sunday night's game with a left leg injury.

Williams had to be carted off in the first quarter and is out for the rest of the game. The 49ers will go with Glenn Dorsey at nose tackle in his absence.

49ers signed NT Ian Williams to a two-year, $3.2 million extension.

The deal includes a $1 million signing bonus. It's a lot of money for a third-year run stopper who's appeared in just four career games, three of which came in 2012. It's a sign the 49ers are planning for turnover on their defensive line.

49ers agreed to terms with former Notre Dame NT Ian Williams.

He was SI.com draft analyst Tony Pauline's No. 1-rated undrafted prospect. Williams played nose tackle in Notre Dame's 3-4 defense, so he'll at least be familiar with the formatting of San Francisco's defensive system. It's also a great fit for the 6-foot-1, 319-pound prospect because the 49ers only have four defensive linemen under contract and are losing Aubrayo Franklin.