newspaper A Bola wrote that the Primeira Liga club Famalicão had shown interest in Kahl. According to the Transfermarket survey from 10 December 2020, Kahl's value will be around 1 million euros. 2021 season At the beginning of 2021, AIK received a bid for Kahl from the MLS club New York Red Bulls on $600,000, a bid that AIK thought was "shameful" and that the club valuing the player at $2,400,000 at least. There must also have been interest in Kahl from the Belgian club Club Brügge and from Italian clubs. Kahl also said in an interview with the Fotbollskanalen that it is in AIK that he will play for at least until the summer of 2021. However, Kahl and AIK began the season 2021 with a exhibition game against AIK's cooperative club Vasalunds IF. AIK lost 2–0 after two quick goals at the start of the match. AIK then played three more exhibition games against Örebro SK twice and IF Elfsborg once (3–1, 0–1, 1–0) all games at Friends Arena. The competition games then started February 20, 2021 with a cup-match against Oskarshamns AIK. Kahl and AIK won the game with 2–1 and Kahl played the whole game. Following to the second game in the cup AIK beat AFC Eskilstuna at home with 4–0 and Kahl played 68 minutes before he was replaced by Yasin Ayari. The former Birmingham City and Sunderland midfielder Sebastian Larsson scored twice. Before what will be the last match in the Swedish Cup for Kahl and his AIK was a derby against arch-rival Hammarby IF. Hammarby pulled the longest straw in the derby and won the match 3–2, which meant that AIK did not advance from the group stage after finishing second in the group. AGF On 24 July 2021, Kahl joined Danish Superliga club AGF on a five-year deal. International career Youth After only training with Sweden's U18 team before, Kahl had never represented any of Sweden's youth teams. Despite that, he was called up to the Swedish U21 national team on 28 August 2020 together with teammate Bilal Hussein. The reason was that Jens Cajuste and Kalle Björklund had been forced to rebid. Sweden would play two European Championship qualifiers against Iceland and Italy on September 4, and September 8, 2020. Although Kahl had been called in as a kind of emergency solution, he still played both matches against Iceland and Italy