Barcelona are interested in signing Andreas Christensen, with the defender yet to commit to a new contract at Chelsea.
Christensen's current deal expires at the end of June, which means that he is now able to sign a pre-contract agreement with foreign clubs.
As reported by Di Marzio, Christensen's future at Chelsea is uncertain after he recently changed agents.
The 25-year-old appeared set to sign a new four-year deal but talks broke down and Chelsea will now have to start negotiations from scratch.
Last month Chelsea boss Thomas Tuchel stated that there would soon be 'good news' regarding Christensen, but it failed to materialise.
The centre-back, who is currently sidelined with a back problem, has made 13 Premier League appearances for Chelsea so far this season.
Having joined Chelsea as a youth player in 2012, Christensen has proceeded to feature 146 times for the senior side.
Barcelona have been linked with another Chelsea defender in Cesar Azpilicueta ahead of a possible move in the summer.
The Catalan club have already signed one player from an English club during this transfer window, bringing in Ferran Torres from Manchester City.
Xavi is determined to strengthen his squad further, but it remains to be seen if he will be able to secure the signing of Christensen on a free transfer.
Chelsea are also uncertain whether they will keep Antonio Rudiger, who has reportedly commenced pre-contract talks with Real Madrid, Bayern Munich, Paris Saint-Germain and Juventus.