Manchester United captain Bruno Fernandes is attracting serious interest from Bayern Munich, while Liverpool are pursuing targets Nico Williams and Nico Schlotterbeck, and Barcelona are weighing up a move for Dusan Vlahovic.
Manchester United value 31-year-old Fernandes at around £40m, with Bayern Munich strongly linked with a move for the Portugal international midfielder.
Liverpool are preparing a bid worth 90m euros (£78m) for 23-year-old Spain forward Nico Williams, currently starring for Athletic Club.
The Reds are also expected to approach Borussia Dortmund over a summer deal for Germany defender Nico Schlotterbeck, 25.
Barcelona are considering signing 25-year-old Juventus striker Dusan Vlahovic, who will be available as a free agent next summer.
Bayern Munich are also monitoring Vlahovic as they brace for the possibility of losing 32-year-old England captain Harry Kane, amid reports that a release clause in his contract could be triggered by rival clubs.
Newcastle United are set to target England midfielder Elliot Anderson in the summer. The 22-year-old, currently at Nottingham Forest, is high on the club’s shortlist as they look to bring him back to the North East.
Real Madrid are closely tracking Bayern Munich defender Dayot Upamecano. The 26-year-old France international is out of contract next summer and is reportedly open to hearing offers.
Los Blancos may send 19-year-old Brazilian forward Endrick out on loan in January, but West Ham United are not considered a likely destination.
Real Madrid are also prepared for January interest in forward Gonzalo Garcia. The 21-year-old impressed at the FIFA Club World Cup but has since slipped down the attacking order.
Barcelona are also monitoring 23-year-old Hoffenheim forward Fisnik Asllani, who may leave the Bundesliga club next summer.
Celtic are closing in on a January move for 20-year-old Red Bull Salzburg midfielder Bobby Clark, who is currently on loan at Derby County in the Championship.
