Campbell was approved by FIFA this year to change affiliation from Iceland to the United States and soon after scored two goals on his debut for the U.S. under-19s in a 3-2 win over England.

Campbell is the son of former Iceland women's forward Rakel Karvelsson, who was born in Los Angeles and played college soccer at North Carolina. His father is American.

Campbell is the latest U.S. player to come through Dortmund's development system, following Christian Pulisic, now at AC Milan, and Gio Reyna.