Manchester United could try to use striker Mason Greenwood as part of a swap deal to sign Juventus centre-back Gleison Bremer, who is valued at £51m.
But the instability and lack of Champions League guarantees at Man Utd have left Bremer unsure of a move, with the Brazil international instead favouring a switch to Liverpool.
Brazil's recent friendly with England was attended by scouts from Newcastle United, who were watching both Bremer and Barcelona winger Raphinha.
Man Utd would be very keen to sign Tottenham Hotspur centre-back Micky van de Ven if the opportunity arose this summer.
RB Leipzig midfielder Dani Olmo is attracting interest from a number of top European sides. Chelsea, Man Utd, Man City, Tottenham and Real Madrid are all keen on the Spain international, who has a £52m release clause in his contract.
Romelu Lukaku has a «strong temptation» to move to Saudi Arabia this summer when his loan with Roma ends and he has to return to Chelsea.
Real Madrid have ruled out a move for Liverpool forward Luis Diaz, with club sources believing a deal is «impossible».
Liverpool have warned Real Madrid that they will have to pay €100m (£85m) to sign right-back Trent Alexander-Arnold.
Barcelona could miss out on the signing of Bayern Munich midfielder Joshua Kimmich after Man Utd joined the race for his signature.
Juventus centre-back Dean Huijsen has caught the eye during a loan with Roma and is now wanted by Liverpool, Borussia Dortmund and RB Leipzig.
Arsenal have been scouting 18-year-old Besiktas striker Semih Kilicsoy, who has been compared to Sergio Aguero.
Sticking in Turkey, Arsenal are leading the race to sign Fenerbahce left-back Ferdi Kadioglu alongside Napoli.
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