The Spaniard played just two games for Villa during his time in England.
The defender has made just one Premier League appearance for the Villains.
PAOK have completed a deal to sign Dimitar Berbatov, who was in talks with Aston Villa.
Greek side PAOK are reportedly close to closing a deal for striker Alfred Finnbogason, who was a key attacking target for Bolton Wanderers.
Manchester United have secured a top-four finish in the Premier League, but a draw with Arsenal means Champions League qualification remains uncertain.