Newcastle are looking at highly-rated Greek international Vasilis Torosidis.
The Magpies dispatched one of their scouts to watch Olympiakos in action at the weekend and it is understood Torosidis was their primary target.
The 22-year-old is an attacking right-back and is rated as one of the best young players in Greece having impressed hugely for Olympiakos this term.
He is already an established member of the Greek national side with ten caps to his name.
Newcastle are not the only side to have taken an interest and scouts from Juventus, Monaco and Atletico Madrid were all believed to be at the Karaiskaki at the weekend to watch Torosidis.
Earlier in the year Rangers were also said to be keeping tabs on him.