The 29-year-old defender has signed a one-year deal at the Stadium of Light after impressing manager Roy Keane during a recent trial.
Harte is a former team-mate of Keane, having shared the pitch with his new boss during the course of his 64-cap Irish career.
Copyright (c) PA Sport 2007, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: http://gms.to/writeforgms