Calderon on Celtic's Radar
Calderon, who signed a 3 year deal in the summer has been in top form all season, scoring three times, and playing his part in the second meanest defence in League One.
Southampton, thought they had signed Calderon in the summer, but he had a change of heart and stayed with table topping Brighton.
Calderon was signed a year ago by Gus Poyet, bringing him out of the wilderness of the Spanish second division. He quickly established himself as one of the most important players in Poyet's team, and is famed for his surges forward.