Michael Essien's agent believes the midfielder could leave Chelsea in January.
The Ghana midfielder spent last season on loan with Jose Mourinho at Real Madrid, but has made just three appearances in the Premier League this term.
Essien joined Chelsea from Lyon in 2005, moving on to claim two Premier League titles, four FA Cups and the Champions League.
But boss Jose Mourinho left him off the list of players eligible to play in the Champions League squad this season, which could make him more attractive to potential suitors.
Agent Fabian Piveteau told French radio station RMC: "He could leave Chelsea this winter.
"Several major European clubs playing in the Champions League were informed and the situation should settle down within the next 10 days.
"You should know that Michael was not on the list of players who can play in the Champions League with Chelsea, so he is free to play in the competition with another club."
Piveteau rejected a return to Essien's first club Bastia out of hand, admitting that the 52-cap midfielder will only seek to move to a club of similar standing.
He said: "In Ligue 1 he could play only at Paris Saint Germain or Lyon, but Bastia, FC Sochaux, for them to support the salary of a Chelsea player, it is already impossible."