Selhurst Park defender Marc Guehi has become a primary target for the Italian club, while Bournemouth striker Antoine Semenyo has a confidential release clause, and the Blues are tracking young Portuguese prospect Cardoso Varela.
Serie A contenders Inter Milan are now part of the hunt to acquire the signature of Crystal Palace centre-back Marc Guehi, though Liverpool continue to be the favourites to sign the 25-year England star.
Bournemouth attacker Antoine Semenyo possesses a buyout clause in his contract, however the team are keeping it private as they intend to keep the 25-year Ghana player, who has attracted interest from Tottenham and Manchester United.
Chelsea and Barcelona are each tracking Dinamo Zagreb's 16-year-old Portugal forward Cardoso Varela, bringing to the transfer speculation around the emerging talent.
Brighton do not plan to sell Cameroonian midfielder Carlos Baleba in the winter window, even though the 21-year-old drawing interest from Manchester United during the previous window.
Manchester United have placed Crystal Palace and England player Adam Wharton, 21, ahead of Baleba on their list of recruitment objectives.
Manchester United are considering renewing Brazilian midfielder Casemiro's deal past this season, however provided the 33-year-old agrees to a wage 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 stay.
Barcelona shot-stopper Marc-Andre ter Stegen, 33, has made it clear that he does not intend to leave the club, even with interest from Manchester United and Newcastle United.
Crystal Palace defender Daniel Munoz is wanted by Barcelona, but the club will not allow the 29-year Colombia international depart in January.
Ex- Tottenham football officer Scott Munn's decision to take a role at Serie A club Parma instead of Nottingham Forest is a further sign that boss Ange Postecoglou is on shaky footing at the club.
Recently appointed Newcastle sporting director Ross Wilson will oversee an audit into the contract situation of the club's top stars, as the team aim to prevent a recurrence of the transfer saga that saw Swedish forward Alexander Isak, 26-year-old, join Liverpool.
Chelsea have no concern over the long-term of Ecuador talent Moises Caicedo, 23-year-old, following the very visible dismissal of his agent.
The midfielder is expected to be offered with a new contract by Chelsea to deter attention from Real Madrid.
Borussia Dortmund are keen on Barcelona's 17-year Spanish midfielder Guille Fernandez, who has not yet make a senior appearance with the Catalan club.
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