Antonio Rudiger is reportedly considering his future at Chelsea amid interest from Paris Saint-Germain and Real Madrid.
The German was out-of-favour under manager Frank Lampard last term, but his fortunes changed after the Englishman was sacked.
Under Thomas Tuchel, he became a vital player in the backline, helping the Blues win the Champions League for the second time.
Despite this, he has yet to commit to a new contract. His current deal with the west London giants expires at the end of the 2021/22 season.
According to Sky Sports, Rudiger has yet to negotiate terms over a new contract after learning of the high-profile interest.
The centre-back will be free to sign a pre-contract with an overseas club in January, and he is currently undecided over his future.
The Blues are expected to sign a new central defender this month. Jules Kounde appears likely to arrive from La Liga club Sevilla.
This will increase the competition for places. The 28-year-old could delay the contract decision until the turn of the year.