The England international midfielder, 22, has featured 61 times for us since making his debut as a substitute in a Europa League tie against FK Partizan in November, 2014.
Harry, who came through the ranks of our Academy, scored on his first Premier League start for the Club in a 3-2 home win over West Ham in November, 2016.
His impressive displays for us since then resulted in a first senior England cap in October, 2017, in a World Cup qualifying match against Lithuania, adding to international honours he had previously earned with the Three Lions from Under-17 all the way up to Under-21 level.
Harry missed the latter stages of the 2017-18 season due to an ankle injury and is scheduled for surgery. He is expected to return in pre-season.