Notre Dame quarterback Tyler Buchner suffered a high-grade AC joint sprain in his non-throwing shoulder in the loss Saturday to Marshall, Irish coach Marcus Freeman told reporters Monday.

Buchner will undergo surgery Tuesday and Freeman expects the recovery process to take four months, which would put the quarterback out for the remainder of the season.

“We can all do the math and probably put it somewhere, maybe January,” Freeman said. “So, that’s where we’re at with that. Moving forward, Drew Pyne will be our starter, and as I said when we addressed the quarterback competition in fall camp I had the utmost confidence in both of those guys being able to lead our offense and lead this football team.”

In the first two games, Buchner was 28 of 50 passing for 378 yards, no touchdowns and two interceptions.

Pyne played in four games during his freshman season in 2020 and two games in 2021. Steve Angeli, a true freshman, will take second-team reps.