Niall Quinn, Sunderland's chairman, said: "It's always very sad when we lose a member of our Sunderland family.
"Harry was a local lad, playing for his hometown club and his loss will be felt by everyone at the football club."
Niall Quinn, Sunderland's chairman, said: "It's always very sad when we lose a member of our Sunderland family.
"Harry was a local lad, playing for his hometown club and his loss will be felt by everyone at the football club."