It turns out, Foster has been dealing with a minor ankle injury in recent days, according to head coach Kyle Shanahan, who joined KNBR's "Murph & Mac" show on Thursday.
"Reuben should be good to go, but he has been battling that," Shanahan said. "It hasn't been a big enough thing to keep him out of practice. But each day you can see there's some time in practice that he trips it up, steps on it, or rolls it a little bit, it definitely affects him to a degree. But he's a tough guy. He can play through this stuff. It's something we don't feel is going to get any worse.
"We've got a lot of guys sore right now. It's that time in training camp. We tried to take the pads off yesterday. Today's going to be a complete walkthrough. Then they're going to have all day, afternoon, to get ready for that game. After our game, the day after a game, we don't do anything, which would be Saturday. We'll just come out and condition them a little bit. We don't do anything as far as practicing against each other. Sunday will be another recovery day for the players."
RELATED
Shanahan went on to say that the 49ers will have two practices on their own next week and then two joint-practices with the Denver Broncos leading into their preseason matchup at Levi's Stadium next weekend. Training camp breaks for the 49ers on Thursday, August 17.
"You kind of have an idea of how this is going to be in camp," Shanahan continued. "I think we hit our toughest stretch at the end of last week. This week they were starting to get back. Hopefully, they'll be better for tomorrow night and I think we'll even be fresher next week come Denver."
You can listen to the entire interview with Shanahan on KNBR.
The injury appears to be a minor one given that Foster has been a full participant in practices and has not appeared in injury reports. "Didn't appear serious," said Joe Fann of 49ers.com following Foster's exit from Wednesday's practice. "Felt more cautionary."
Foster is expected to play and start at the Will linebacker spot for the 49ers on Friday against the Chiefs.
More San Francisco 49ers News
-
Brock Purdy update: Kyle Shanahan says 49ers QB has been 'great all week'
49ers quarterback Brock Purdy struggled during last Sunday's game against the Buffalo Bills. Difficult weather conditions and his recent recovery from a shoulder injury likely contributed to his performance. This week, Purdy has been a full participant in practice and is... -
Kyle Shanahan reflects on 49ers' Week 14 win vs. Bears, provides injury updates
San Francisco 49ers head coach Kyle Shanahan spoke with reporters during a conference call on Monday, the day after the team's 38-13 win over the Chicago Bears. Here's everything he said. Transcript provided by the San Francisco 49ers Communications staff. Opening... -
Kyle Shanahan addresses Nick Bosa's status, provides 49ers injury updates
Nick Bosa is one of several San Francisco 49ers players who will not participate in practice on Wednesday as the team begins preparations for its Week 14 matchup against the Chicago Bears. The star defensive end has missed the last two games due to hip and oblique... -
49ers vs. Rams injury updates: Ji'Ayir Brown questionable to return
The San Francisco 49ers entered Thursday night's NFC West showdown against the Los Angeles Rams without key players, most notably left tackle Trent Williams, who is sidelined for the fourth straight game with an ankle injury. On defense, standout rookie safety Malik Mustapha...