But Raheem Sterling, Pierre-Emerick Aubameyang, Kalidou Koulibaly and Marc Cucurella were signed to contribute immediately.

Source: https://www.independent.co.uk/sport/football/chelsea-joao-felix-transfers-todd-boehly-b2260028.html

Chelsea defender Kalidou Koulibaly says that the Blues must keep improving their performances this season, as they take on Leicester City in the Premier League on Saturday at the King Power Stadium.

Source: https://www.completesports.com/chelsea-must-keep-improving-this-season-koulibaly/

It has, of course, spent a little injudiciously at times: Kalidou Koulibaly may, it turns out, have been past his prime, and Wesley Fofana’s injury record might, harshly, have been seen as a red flag.

Source: https://www.nytimes.com/2023/01/13/sports/soccer/juventus-napoli.html

Kalidou Koulibaly, Mason Mount, Christian Pulisic, Conor Gallagher and Hakim Ziyech are said to be at risk of going.

Source: https://www.thesun.co.uk/sport/21599326/chelsea-joao-felix-declan-rice-transfer/

Koulibaly has also picked up and early yellow card for Chelsea following a high boot.

Source: https://www.dailymail.co.uk/sport/live/article-11758047/Chelsea-vs-Southampton-Premier-League-2022-23-Live-Result.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

N’Golo Kante has already completed a move to Saudi Arabia, while Edouard Mendy, Kalidou Koulibaly and Hakim Ziyech could join him there.

Source: https://www.independent.co.uk/sport/football/man-city-chelsea-mateo-kovacic-transfer-b2361590.html

One fan tweeted: "Better than Koulibaly and Cucurella already."

Source: https://www.thescottishsun.co.uk/sport/football/10561183/thiago-silva-chelsea-marc-cucurella-kalidou-koulibaly-isago/

Sterling and Koulibaly were two of the early arrivals in Boehly's unprecedented transfer spree.

Source: https://www.express.co.uk/sport/football/1760859/chelsea-news-todd-boehly-raheem-sterling

They signed Fofana for €80.4 Million, Badiashile and Koulibaly each for €38 Million.

Source: https://www.ghanamma.com/ke/2023/01/12/best-xi-players-signed-by-chelsea-in-the-2022-2023-season-and-their-transfer-fees/

While the likes of Karim Benzema, N'Golo Kante and Kalidou Koulibaly have since followed.

Source: https://www.thesun.co.uk/sport/22897828/gianluigi-buffon-saudi-transfer-parma/