49ers unsure if All-Pro tackle Trent Williams can play Rams

It’s possible that Trent Williams will have the same role on Sunday that he had the last time the 49ers played the Rams at SoFi Stadium: spectator.

The 49ers All-Pro left tackle suffered a sprained ankle in their playoff win over the Packers on Saturday. and his status is uncertain for Sunday’s NFC Championship Game against Los Angeles.

Williams, who left the locker room on crutches Saturday night, missed the 49ers’ decisive win over the Rams in their regular-season finale on Jan. 9 with a sprained elbow. Head coach Kyle Shanahan said on Monday he was “not exactly sure” if Williams, 33, would be able to play despite his injury after post-match X-rays came back negative.

“We’ll have to manage it and see how his week goes,” Shanahan said.

Williams missed the Oct. 24 loss to the Colts with a sprained ankle, and Shanahan said Williams’ current ankle problem may be, at least in part, an aggravation of a past injury. Shanahan said that was the case last week with defensive end Jordan Willis overcoming what Shanahan initially said was a sprained ankle, which usually sidelines players for weeks.

“You have to see how the week goes and if it heals,” Shanahan said of Williams. “If it was a high (ankle sprain), I would rule it out. But there are more components. … We must therefore wait before declaring what it is. You need to see how it heals and reacts throughout the week. That’s about all I can say. And that’s what we’ll be waiting to find out.

If Williams is ruled out, the 49ers will likely replace him with Colton McKivitz, who played his first snaps of the season when Williams missed out on their 27-24 win over the Rams this month. The 2020 fifth-round pick was responsible for two of three sacks the 49ers allowed against the Rams, whose defensive line includes All-Pro tackle Aaron Donald (12.5 sacks) and rushers Von Miller and Leonard Floyd, each having 9.5 bags. during the regular season.

The 49ers also played without nickel cornerback K’Waun Williams against the Rams two weeks ago. And it’s uncertain whether they’ll have another key cornerback, rookie Ambry Thomas, on Sunday.

Thomas was sidelined against the Packers with a bone bruise in his knee he suffered in a wildcard win at Dallas on January 16. He was replaced by Dontae Johnson, who was part of a secondary that didn’t allow a touchdown pass. by Green Bay quarterback Aaron Rodgers and limited it to 55 passing yards in the second half.

Shanahan said it was clear Thomas couldn’t play after the team arrived in Green Bay Thursday night.

“We were hoping he was going to be close,” Shanahan said, “but by the time we got there there was no point working him. So it didn’t come as close as we hoped. We know he is better today than he was on Saturday, I think he has a much better chance to play this week.

All-Pro wide receiver Deebo Samuel avoided a serious injury when he was hit in the leg on his critical 9-yard run on 3rd-and-7 late in the fourth quarter against the Packers. Shanahan said Samuel, who jumped off the pitch in pain, not putting weight on his right leg, was hit in the side of his knee and lower leg.

“We expect to see him on the training ground this week,” Shanahan said.

Eric Branch covers the 49ers for The San Francisco Chronicle. Email: ebranch@sfchronicle.comTwitter: @Eric_Branch

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