Fiorentina defender Manuel da Costa is interesting Sunderland boss Ricky Sbragia.
The Portugal Under 21 centre half played in the Champions League with PSV Eindhoven before moving to Fiorentina a year ago.
Sunderland boss Ricky Sbragia is keen to strengthen the centre of defence and has already shown an interest in Bolton's Danny Shittu and Calum Davenport of West Ham.