Minnesota Vikings rookie quarterback J.J. McCarthy underwent a second surgery on his right knee earlier this week.

Coach Kevin O’Connell said Wednesday the procedure occurred because of swelling that developed when McCarthy began ramping up the intensity of his rehab. The initial procedure in mid-August was a season-ending operation to repair significant meniscus damage.

“We know he had what I would consider an extensive injury in training camp, he’s really knocked it out of the park every step of the way,” O’Connell said Wednesday. “As his rehab picked up, we noticed a little swelling in there. With the time that we do have, he’s been doing everything we asked of him. We just wanted to make sure that there was no cause for concern, and all reports were very positive. He’s on the original timeline and in good shape. I feel really good about where he’s at.”

McCarthy remains on track to be ready prior to the 2025 season, when he’ll get his chance to boost a draft class that already produced four other starters: Caleb Williams (Bears), Jayden Daniels (Commanders), Drake Maye (Patriots) and Bo Nix (Broncos).

McCarthy sustained the injury in a preseason game against the Las Vegas Raiders on Aug. 10. He completed 11 of 17 passes for 188 yards, two touchdowns and one interception in the contest.

McCarthy was the No. 10 overall pick in the 2024 draft out of Michigan. He quickly picked up the Vikings’ offense and was the favorite to win the starting job prior to his injury.

Seven-year veteran Sam Darnold has revived his career by passing for 2,141 yards, 17 touchdowns and 10 interceptions in nine games. The TD passes are just two off his career high.

Minnesota (7-2) visits the Tennessee Titans on Sunday.