Which Chelsea summer transfer was the most important?

Chelsea made a total of five signings during the summer transfer window, addressing key areas of the squad that needed strengthening.

Michy Batshuayi joined from Marseille, N’Golo Kante from Leicester, Eduardo from Dynamo, Marcos Alonso from Fiorentina and finally, David Luiz from Paris Saint-Germain. So now it is all said and done, we’re after the fan’s view.

Out of the five, who was the most important arrival of them all? Out of the options below, take a pick and decide.