The 32-year-old has been a Stamford Bridge stalwart since joining in 2012, making at least 40 appearances in all competitions in each of his nine full seasons at the club so far.
However, he has fallen down the pecking order so far this term, starting just two of Chelsea's last eight Premier League games under Thomas Tuchel.
Azpilicueta's contract in West London expires next summer, meaning that he is free to discuss terms with overseas clubs from January 1.
The Spain international is understood to want to stay at Chelsea, but negotiations have stalled due to a disagreement over the length of the contract on offer.
Azpilicueta has made 446 appearances for Chelsea across all competitions, helping them to win every trophy available to them in English and continental football. body check tags ::