#6 Petr Cech
Chelsea let go of Petr Cech so that they could give Thibaut Courtois an opportunity. That did not work out so well. With Courtois gone, Chelsea has invested in Kepa. While it is yet to be seen how Kepa turns out, it is fair to say that every Chelsea fan misses Cech.
Cech is very dear to Chelsea fans as he was vital in the Champions League Final, saving 3 penalties and allowing Chelsea to lift the cup. Adding to that, Cech also won 4 Premier Leagues in his time at Chelsea.
Cech is arguably the greatest keeper to ever play at Chelsea, and at one time was in the top 3 goalkeepers in the world. He has always remained dignified and classy despite his move to Arsenal. If possible Chelsea fans would love to get a younger version of Cech back at Chelsea.