Cameron Carter-Vickers was not on the field for Celtic on Sunday, but it didn’t stop him from ending the weekend as a league champion for the second time.

Celtic’s 2-0 road win over Hearts at Tynecastle Park sealed back-to-back Scottish Premiership titles for Ange Postecoglou’s squad. Carter-Vickers recently underwent knee surgery following Celtic’s advancement into the Scottish Cup Final later this month, sidelining him for the rest of the season.

He is expected to be sidelined 3-4 months following the surgery, a source close to Carter-Vickers confirmed to SBI earlier this month.

The U.S. men’s national team defender’s final appearance of the season came on April 30 as Celtic edged Glasgow rivals Rangers 1-0 at Hampden Park in the semifinal round.

The 24-year-old joined Celtic on a permanent transfer last summer and has since developed into one of the top defenders in the Premiership this season. The former Tottenham centerback totaled 39 combined appearances for Celtic, helping the current league-leaders win the Scottish League Cup and move one victory away from clinching a domestic treble.

He also appeared in the UEFA Champions League for the first time in his career.

Carter-Vickers has totaled 83 combined appearances for Celtic over two seasons, which has helped him fight his way back into the USMNT picture. However, his recent knee injury will force him to miss the USMNT’s CONCACAF Nations League and Gold Cup involvement.

Celtic faces a trip to rivals Rangers next week before final matches against St Mirren and