The midfielder, 21, has continued his progress this season, including marking his first Premier League start with his first goal in the 3-2 win against West Ham in November.
He has made 25 appearances in all competitions this term, including two starts in the Champions League.
A product of our Academy, Harry played for our junior teams before joining us full-time in July, 2012. He made his senior debut in the Europa League against FK Partizan in November, 2014.
Harry's performances earned a first England Under-21 cap against France in November, having previously won caps at Under-17, Under-18, Under-19 and Under-20 levels.