Liverpool have signed Hungarian midfielder Dominik Szoboszlai from Bundesliga club RB Leipzig for £60 million on a five-year deal.
Former Arsenal, Chelsea and Barcelona midfielder Cesc Fabregas has announced his retirement from football at the age of 36.
Chelsea have completed the signing of Senegal forward Nicolas Jackson on an eight-year contract from Villarreal.
Manchester United have agreed to sign England midfielder Mason Mount from Chelsea for an initial £55 million ($69 million), according to reports.
Senegal captain Edouard Mendy has left Chelsea after three years to join Saudi Pro League side Al-Ahli.
Tottenham Hotspur have signed England midfielder James Maddison on a five-year deal for £40 million from Leicester City.
Arsenal have signed Germany forward Kai Havertz from Chelsea on a five-year deal until 2028 for £65 million.
Manchester City have announced the signing of Croatia midfielder Mateo Kovacic from Chelsea following the departure of captain Ilkay Gundogan.
Arsenal manager Mikel Arteta believes the Gunners have to strengthen their squad to challenge Manchester City for the Premier League title next season.
Senegal captain Kalidou Koulibaly has become the latest footballer to head to Saudi Arabia after joining Al-Hilal from Chelsea.