With a squad of 33 players plus the arrivals of Malo Gusto, Levi Colwill, Ian Maatsen and Christopher Nkunku in the summer, Chelsea's first thought ahead of the next window is for a clearout not for even more recruits. That being said, there are still areas that still need major improvement.
The goalkeeping department is being questioned with Kepa Arrizabalaga's hit-and-miss form as well as Edouard Mendy's lack of gametime. Up front, there is a lack of goals and a new centre forward is high on the list of priorities despite a plethora of attacking options.
It is midfield that has been the area of concern for longest though. Before Enzo Fernandez joined in January it has been over four years since the last new player was added to the squad permanently in that role.