Crystal Palace centre-back Marc Guehi emerges as a key objective for the Italian club, while Bournemouth striker Antoine Semenyo has a confidential release clause, and the Blues are tracking young Portuguese teenager Cardoso Varela.
Italian powerhouse Inter Milan have joined the hunt to sign the services of Crystal Palace centre-back Marc Guehi, however Liverpool remain the frontrunners to land the 25-year-old English international.
Bournemouth attacker Antoine Semenyo possesses a release clause in his deal, but the team are maintaining it private as they aim to hold onto the 25-year-old Ghanaian player, who has attracted interest from Tottenham and Manchester United.
Chelsea and Barcelona are each monitoring Dinamo Zagreb's 16-year Portuguese striker Cardoso Varela, adding to the recruitment speculation around the young prospect.
Brighton have no intention to cash in on Cameroon player Carlos Baleba in the winter window, despite the 21-year attracting attention from Manchester United last summer.
Manchester United have placed Crystal Palace and English player Adam Wharton, 21, ahead of Baleba on their shortlist of transfer targets.
Manchester United are evaluating extending Brazil star Casemiro's deal beyond this campaign, but provided the 33-year-old agrees to a salary reduction.
Attention in Casemiro has come from Brazil and Saudi clubs, but Manchester United boss Ruben Amorim could argue for the former Real Madrid player to remain.
Barcelona goalkeeper Marc-Andre ter Stegen, 33, has made it clear that he does not intend to leave the club, despite attention from Manchester United and Newcastle United.
Crystal Palace full-back Daniel Munoz is desired by Barcelona, yet the club will not allow the 29-year Colombia international depart in January.
Former Tottenham football officer Scott Munn's choice to take a role at Italian side Parma instead of Nottingham Forest is a further indication that boss Ange Postecoglou is on shaky footing at the City Ground.
New Newcastle recruitment chief Ross Wilson will oversee an review into the deal status of the team's top players, as the club look to avoid a recurrence of the player drama that saw Swedish striker Alexander Isak, 26-year-old, move to Liverpool.
Chelsea are not worried over the future of Ecuador talent Moises Caicedo, 23, following the public axing of his agent.
The midfielder is expected to be rewarded with a new contract by Chelsea to deter interest from Real Madrid.
Borussia Dortmund are keen on Barcelona's 17-year Spanish youngster Guille Fernandez, who has yet to earn a senior appearance with the Catalan club.