Arsenal fullback Nacho Monreal is being linked with a return to Athletic Bilbao.
Marca says Athletic are exploring the prospect of re-signing Monreal this month as they go on a January spending spree.
Athletic are also in talks with Real Madrid for midfielder Asier Illarramendi and aim to stiffen their defence with the return of Monreal.
Monreal signed for the Gunners two seasons ago and established himself as a first-choice for manager Arsene Wenger last term.
The fullback has filled in at centre-half for injury-hit Arsenal in recent months.
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