Mavrias has Black Cats medical
Greek teenage winger Charis Mavrias has arrived in Sunderland for a medical ahead of a £2.5million move from Panathinaikos.
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The 19-year-old Greece international, who has two caps to his name, has begun talks at the Stadium of Light.
Mavrias is the second youngest player to play in the Champions League - at the age of 16 years and eight months - and has since made more than 60 appearances for Panathinaikos, scoring six goals.