Michael Essien could leave Chelsea in the transfer window, according to his agent.
The Ghana midfielder spent last season on loan with Jose Mourinho at Real Madrid and has managed just three Barclays Premier League appearances this term.
Essien joined Chelsea from Lyon in 2005, moving on to claim two Premier League titles, four FA Cups and the Champions League.
The 31-year-old has been omitted from Chelsea's Champions League squad so far this season.
Agent Fabian Piveteau believes that could help pave the way for a move to another big European club during the January window.
"He could leave Chelsea this winter," Piveteau told French radio station RMC.
"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."
Meanwhile Blues striker Patrick Bamford could be swapping MK Dons for Derby as he builds experience through loan deals meanwhile.
The 20-year-old has fired 16 goals for the Dons this season, and could now be set to swap Sky Bet League One for the Championship.
Nottingham Forest academy product Bamford joined Chelsea in January 2012, signing a five-year contract.
Manager Steve McClaren admitted England Under-21 star Bamford fits the profile of loan targets for the club.
"We are having a little look around," he told the Derby Telegraph.
"I am pleased with the team, pleased with the squad but maybe it has not got that depth.
"We are going to have a little look at that but, certainly, if everyone stays fit, we have got 15 or 16 players contributing and doing very well.
"What we have done is we have gone for younger players, the likes of Andre Wisdom and Michael Keane, and even Simon Dawkins, who I keep thinking is only 18 or 19, and he is 26.
"So, we have gone for younger players from the top teams and we want that quality.
"We are looking for youngsters again to add to the squad and improve the quality we have got."