Lukaku, Aguero, Kane, Sanchez, Mane crucial; Mata, Cahill, Giroud wane
Back in March, ESPN FC's club bloggers and correspondents selected their side's most important players for the season ahead.
Now, with the transfer window over, each club has a revised list of key performers. Who is in, who is out and who has flopped? Click on each club for a detailed rundown of the key men and those who have fallen by the wayside.
CHELSEA: It may be some time before we see Tiemoue Bakayoko in full flow and Cesc Fabregas is defensively limited, meaning N'Golo Kante's energy and intelligence will be crucial. -- Liam Twomey