The Greek striker is wanted back in his homeland, whilst teams in Denmark, Belgium and Holland are also keen.
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.