CBS Sports: 49ers Add a five-Star Sensational Player to Active Roster, Place Hargrave and Robinson on Injured Reserve.

Sam Okuayinonu, a defensive end, was originally cut to 53 players at the conclusion of training camp, but he is now back on the 49ers active roster.

On Saturday, the 49ers placed linebacker Curtis Robinson and defensive tackle Javon Hargrave on injured reserve and promoted Okuayinonu.

Additionally, the 49ers promoted defensive tackle Evan Anderson and safety Jaylen Mahoney, two undrafted rookies, from the practice squad. On Monday, both players will return to the practice squad.

When the 49ers play the New England Patriots at Levi’s Stadium on Sunday, Okuayinonu, Anderson, and Mahoney are anticipated to be in uniform. Mahoney and Anderson are expected to play in their first NFL regular season games.

This season, Okuayinonu has made two appearances. Besides a sack, he has three tackles. He was included in the 49ers’ initial 53-man roster, but in a sequence of moves one day later, he was dismissed.

Anderson (6-foot-3, 326 pounds) played four years at Florida Atlantic, making 39 appearances in games. Anderson played in 12 games during his senior year of college, recording 57 tackles, 5.5 tackles for loss, 3.5 sacks, and one forced fumble.

With Hargrave sidelined and presumed starter Jordan Elliott classified as questionable due to a foot issue, Anderson offers depth at defensive tackle.

Mahoney (5-11, 200) spent five seasons at Vanderbilt, appearing in 54 games with 45 starts. He started every game in his senior year, totaling 59 tackles and a team-high six passes defensed. As team captain, he was.

This week, the 49ers cut veteran Tracy Walker III off the practice squad, seemingly indicating their trust in Mahoney’s ability to play.

Talanoa Hufanga, the starting safety, has an ankle injury and is rated as questionable for Sunday’s game. In the event that Hufanga is sidelined, the 49ers will start George Odum or Malik Mustapha in Hufanga’s place.

The 49ers made roster changes on Saturday, anticipating that Robinson and Hargrave would miss the entire year.

When the 49ers lost to the Los Angeles Rams in Week 3, Hargrave tore his triceps. If the 49ers go far in the NFL playoffs, coach Kyle Shanahan hinted that Hargrave could be able to make a comeback.

Robinson sustained an ACL tear early in Thursday’s practice. Surgery to end the season is planned for him.