Atletico Madrid are following Olympiacos fullback Vassilios Torosidis.
The 22 year-old is highly-rated across Europe after an impressive Champions League campaign this season.
Ironically, Torosidis could arrive as a replacement for fellow Greece international Gourkas Seitaridis at Atletico. Seitaridis has failed to establish himself at the Vicente Calderon and is being made available ahead of the summer market.