West Bromwich Albion have confirmed Borja Valero is in talks with Villarreal.
The 25-year-old has made it clear he wants to return to Spain on a permanent basis.
A West Brom club statement read: "Valero has been given permission to travel to the Spanish club for a medical and to train with them while discussions continue.
"He rejoined West Brom for pre-season training last weekend following a season-long loan in La Liga with Real Mallorca.
"But after returning to Albion, he has expressed a strong desire to continue his career in Spain for professional and family reasons.
"Albion rejected an offer from Sevilla for Valero last month but agreed to meet Villarreal yesterday for talks on a possible deal. This dialogue is ongoing."