The Chelsea first team squad now looks a lot different to how it did when the new owners came in for their first summer transfer window. One of the marquee signings in that time was Kalidou Koulibaly, who many were tipping to be the finishing touches on what could have been an immense defence under Thomas Tuchel. However, the Senegal international was gone within a year after he failed to live up to the standards required at Stamford Bridge. The following summer saw Chelsea recruit in a far smarter way as they looked to give the right backing to manager at the time Mauricio Pochettino. One of …