Kübel, 24, was originally drafted 28th overall by Toronto FC in the 2018 MLS SuperDraft. Prior to being drafted, he spent all four seasons of his college career at the University of Louisville. With the Cardinals, he made 82 appearances, scoring 21 goals and adding 26 assists. This past season, Kübel was named a United Soccer Coaches (USC) First Team All-American. He also earned USC First Team All-South Region and All-Atlantic Coast Conference honours. Kübel, born in Stuttgart, Germany, spent time in the youth systems of FC Schalke 04 and Borussia Dortmund.