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.
Barcelona have confirmed the signing of German midfielder Ilkay Gundogan on a free transfer after his contract with Manchester City ended.
Chelsea have rejected a third bid of around £55 million from Manchester United for midfielder Mason Mount.
Newcastle United are edging closer to signing Italy midfielder Sandro Tonali from Serie A side AC Milan.