Timo Werner, Emerson, Romelu Lukaku, Malang Sarr, Antonio Rudiger, Andreas Christensen, Matt Miazga, Jake Clarke-Salter, Levi Colwill, Charly Musonda Jr, Dujon Sterling, Baba Rahman, Ross Barkley, Ethan Ampadu, Danny Drinkwater and Marcos Alonso and Callum Hudson-Odoi.
Those are the list of players who have left Chelsea either permanently, on loan, or ended their contracts with the club at the time of writing.
This group could still be added to by the time you read this. Billy Gilmour is reportedly close to a deadline day transfer move to Brighton for £9m, whilst the likes of Michy Batshuayi have still not found a new destination despite an expectation he would depart.