DORTMUND, Germany (AP) — Borussia Dortmund midfielder Christian Pulisic has been ruled out for at least two games with a muscle tear in his calf.

The 20-year-old Hershey native missed Dortmund's Champions League game against visiting Monaco on Wednesday and the club says he will definitely miss the side's Bundesliga game at home to Augsburg on Saturday.

The club did not give further details on when he could return.

Pulisic was included on Monday in the United States' 24-man roster for games against Colombia on Oct. 11 and Peru five days later.

Pulisic made the last of his 21 appearances for the U.S. against Bolivia on May 28 at Talen Energy Stadium. He missed last month's games against Brazil and Mexico because of an unspecified muscle injury, then scoretd two decisive goals within four days — including the winner on his birthday against Club Brugge — after returning to Dortmund's lineup.