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Portsmouth defender Jack Whatmough has signed a one-year contract extension with the League Two club up until 2017.

Whatmough, 17, made his debut against Southend in November and has made a further eight first-team appearances.

He also made his England Under-18 debut against Croatia last month.

"Jack has made a big impression this season and deserves a new deal," said caretaker manager Andy Awford. "We're delighted that he's shown commitment to the Pompey cause by agreeing to stay."

Whatmough signed his first professional contract in August 2013.