Villarreal are set to renew their interest in Sol Campbell should Martin Caceres leave this summer.
Uruguay international Caceres has become the latest transfer target for Barcelona and his departure would leave the Yellow Submarines short of defensive options.
With Manuel Pellegrini's men set for a return to UEFA Champions League action next season, their boss is aware that he can ill afford to see his squad numbers dwindle during the close season.
The club are yet to confirm that Portsmouth centre-half Campbell would be their preferred choice to marshal their defence next term, but they have previously expressed an interest in the England international.
Villarreal director Jose Manuel Llaneza admits that the club will look to bolster their backline over the coming weeks, but has refused to rule out the possibility of Caceres remaining at El Madrigal.
"Caceres is definitely in our plans for next season," he said.
"But if we reach an agreement with Barca then it becomes clear that the priority will be to reinforce our defence."