Brentford have signed teenage South Korean defender Kim Ji-Soo from K League Two side Seongnam for an undisclosed fee on a four-year contract.
Kalidou Koulibaly has left Chelsea after only one season to join Saudi Professional League side Al-Hilal.
Chelsea have sneaked in front of Arsenal in the race to sign Brighton midfielder Moses Caicedo, according to reports.
Manchester City are looking to sign Paris Saint-Germain defender Achraf Hakimi, according to reports.
Arsenal boss Mikel Arteta says it still "hurts deeply" to have missed out on the Premier League title, but he is happy with the progress he has made after taking over a club that had lost its "soul".
Everton midfielder Tom Davies will leave the club when his contract expires at the end of the month after turning down a new deal, the club have announced.