Egypt forward Mohamed Salah, 28, could be the player to make way if Liverpool are to seal a move for Paris St-Germain's France forward Kylian Mbappe, 22, this summer.
Chelsea will attempt to beat Real Madrid to the signing of Bayern Munich'sAustria defender David Alaba, 28, who is set to leave the German champions when his contract expires at the end of the season.
Meanwhile, Chelsea's hopes of signing two other defensive targets - RB Leipzig'sFrance international Dayot Upamecano, 22, and Bayern Munich's Germany international Niklas Sule, 25 - rest on Bayern's transfer plans.
West Ham will not rush to make a decision over whether they attempt to make on-loan 28-year-old England midfielder Jesse Lingard's move from Manchester United permanent.
Manchester United boss Ole Gunnar Solskjaer is keen to sign 21-year-old English right-back Max Aarons from Norwich City when the transfer window reopens.
Meanwhile, Solskjaer could face competition for Aarons from Tottenham, with Spurs eyeing the defender as a potential summer replacement for their Ivory Coast right-back Serge Aurier.
The application of Wales forward Gareth Bale, 31, is being questioned at Tottenham and patience is wearing thin over the Real Madrid loanee's work-rate.
Sheffield United's English midfielder John Lundstram says "everything is still on the table" regarding his future, amid links with NewcastleUnited and Rangers.