Boateng has become a fixture on Teesside since his move from Aston Villa in 2002 and was chosen as Gareth Southgate´s successor after he traded the captain´s armband for the manager´s office at The Riverside.
Silkman said: "I´ve had three or four clubs phone me to ask about his availability, so it is possible, but I´m not 100% sure yet."
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