Selhurst Park centre-back Marc Guehi is now a primary target for the Italian club, while Bournemouth striker Antoine Semenyo holds a confidential release clause, and the Blues are tracking young Portuguese prospect Cardoso Varela.
Italian powerhouse Inter Milan are now part of the race to secure the signature of Crystal Palace defender Marc Guehi, however Liverpool continue to be the frontrunners to obtain the 25-year English star.
Bournemouth attacker Antoine Semenyo has included a release clause in his contract, however the club are holding it private as they aim to hold onto the 25-year-old Ghana player, who has attracted interest from Tottenham and Manchester United.
Chelsea and Barcelona are each watching Dinamo Zagreb's 16-year-old Portugal forward Cardoso Varela, adding to the transfer rumours around the young prospect.
Brighton have no intention to sell Cameroon midfielder Carlos Baleba in January, even though the 21-year-old drawing interest from Manchester United last summer.
Manchester United have placed Crystal Palace and England midfielder Adam Wharton, 21-year-old, ahead of Baleba on their list of recruitment objectives.
Manchester United are considering extending Brazilian midfielder Casemiro's contract beyond this season, however only if 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 may make a case for the ex- Real Madrid star to stay.
Barcelona shot-stopper Marc-Andre ter Stegen, 33-year-old, has stated that he has no plans to leave the team, even with interest from Manchester United and Newcastle United.
Crystal Palace defender Daniel Munoz is desired by Barcelona, but the club will refuse to let the 29-year Colombia player 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 sign that manager Ange Postecoglou is on uncertain footing at the City Ground.
Recently appointed Newcastle sporting director Ross Wilson will oversee an review into the deal status of the team's top stars, as the team look to avoid a recurrence of the player saga that saw Swedish forward Alexander Isak, 26-year-old, join Liverpool.
Chelsea are not worried over the long-term of Ecuadorian midfielder Moises Caicedo, 23, following the public axing of his agent.
Caicedo 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-old Spain midfielder Guille Fernandez, who has not yet make a senior appearance with the Catalan club.
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