Before his move to Atletico Madrid, I was hoping Manchester City would sign him and that didn't plan out. He's such an excellent player when he's used correctly, I think he would have exploded under Pep Guardiola but that didn't happen and I hope Tuchel could look into his matter.
There are several reasons why Chelsea's attack isn't functioning, full-backs are a current problem, there is a lack of creativity but a very big problem is the dysfunctional focal point in Romelu Lukaku.
Let's now envision a scenario where Chelsea and Atletico Madrid agree to a swap between Romelu Lukaku and João Felix. Atletico Madrid gets a striker that suits them and Chelsea gets the 9 that suits them.
Although the most important thing is João Felix's profile. João is best described as a versatile attacker being able to play wing or 9 but he is primarily a 10. This would translate to a false 9 at Chelsea where he'd be used to collect deep to carry and play-make.
He offers more fluidity to their front 3 and more creativity as well. With Romelu Lukaku, the central lane is closed yet with João Felix the front 3 can rotate to a central position and attack with fluidity.
An exceptionally talented player and the perfect profile for their attack. João Felix is the ideal player to be their attacking focal point.