Europe's biggest clubs are watching Thiago Silva's situation at PSG.
The defender has so far refused to consider discussing a new deal, with French sources reporting he remains upset with PSG management.
Thiago Silva is still angry after being blocked from competing at the Rio Olympics for Brazil by club management.
The stand-off between the two parties shows no sign of ending, which is encouraging clubs across Europe that the defender can be tempted away.
A return to AC Milan has been mooted, though in England, Chelsea, Manchester City and Manchester United are also in the market for an experienced centre-half - and Thiago Silva would fit the bill.
The defender's current deal runs to 2018.