The 17-year-old has burst onto the scene for Vincent Kompany’s side, coming off the bench to score his first Bundesliga goal in the recent 3-0 win over Borussia Monchengladbach.
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As a result, several European giants have registered an interest, including the likes of Chelsea, Man City, and Real Madrid.
According to a report from Sky Sport, Bayern Munich aren’t worried and already have a new deal in place for the young winger.
Karl has spoken of his desire to establish himself at the club, telling the club’s website earlier this year: "I want to assert myself at Bayern Munich and one day play for the club in the Champions League."
The youngster recently hired former Bayern and Cheslea midfielder Michael Ballack as his new agent.