Athletic Bilbao reportedly hold an interest in securing a reunion with Chelsea goalkeeper Kepa Arrizabalaga.
In 2018, Bilbao allowed Arrizabalaga to move to Stamford Bridge for a fee of £71.6m, with the Spaniard penning a contract with the Blues until 2025.
According to The Sun, Bilbao are monitoring the situation ahead of potentially making contact with Chelsea over their former player's availability.
Should they wish to push through a permanent exit, Chelsea would likely have to accept a significant financial loss on what they paid less than two years ago.
The report also adds that Arrizabalaga may have to consider a substantial wage cut in order to return to San Mames.