Chelsea's decision to sell Madueke is reportedly due to concerns over his performance and attitude. The player has been underwhelming in his progress, and coaching staff have expressed worries about his behavior during training sessions.

Chelsea's head coach, Enzo Maresca, had previously addressed concerns about Madueke's attitude, highlighting the need for improvement. As a result, the club has given Madueke permission to leave the squad for the Club World Cup, allowing him to travel back to London and undergo a medical with Arsenal.

It is expected that Madueke will complete his transfer to Arsenal soon, bringing an end to his time at Chelsea.