"A number of top sides have been chasing Connor for some time now, so naturally we are absolutely delighted he has chosen to come to Sunderland," he told the club's official website.
"He's still very young, but at 6ft 3in he's a physical presence. With his height and style of play, he will offer us a threat in front of goal and complement our existing strikers.
"We have been watching him for a while now and he is improving and developing all the time. He's a great prospect and I'm sure our supporters will love watching him play."