Mohamed Salah's goal for Liverpool against former employers Chelsea on Saturday made him the 20th ex-Blues star to have scored against them in the Premier League.
Manchester City's Kevin De Bruyne has also joined the club this season, as part of a list of 20 ex-Chelsea players to have made them pay in the modern top flight.
Here, Sportsmail looks back at the 20 former Chelsea men - and how much the champions regret letting them go.
Graeme Le Saux (Blackburn Rovers - December 5, 1993)
Chelsea and Le Saux grew frustrated with each other before he left Stamford Bridge in 1993.