Chelsea spent over £200million on new signings this summer, with Hakim Ziyech, Timo Werner, Ben Chilwell, Kai Havertz, Malang Sarr, Thiago Silva and Edouard Mendy all joining the club.
Chelsea boss Frank Lampard now faces dealing with an oversized squad having failed to move on several players before the window closed last night.
Chelsea defenders Antonio Rudiger, Marcos Alonso and Fikayo Tomori looked likely to leave Stamford Bridge this summer, but all three failed to secure moves elsewhere.
The three players were linked with a transfer away from the club on transfer deadline day but ended up staying at the club.
Lampard now has a squad with five centre-backs and three left-backs and this will certainly create a problem for the Chelsea boss.