Kehl said in an interview with Sky Germany: "I experience Jadon as changed, I experience him as more mature in his personality. He knows that he is challenged and that he is coming to Borussia Dortmund in a different role.
"He's always on time - even over-punctual. He seems incredibly motivated and committed and to see such a player on the pitch is fantastic. I think we'll have fewer problems than in the past."