Chelsea are doing great in the transfer market, they have brought in Raheem Sterling which comes as a upgrade to their attack with his pace and dribbling skills. Priotizing building their defense now is a solid move. Reportedly, a deal for Koulibaly is already agreed which is a smart move for Chelsea to replace Rudiger and a few more additions to their defense and a good striker and they are good to go.
Chelsea is focusing on their defence and will likely spend more than €100m for that without including Sterling expenses. There is rumours about Koulibaly, Koundé, Aké and Kimpembe. Such spending should improve a lot the team so they can compete with City, Liverpool, Arsenal and Spurs next season since all these teams are working hard to build a solid squad!