Republic of Ireland midfielder Gibson, who joined Sunderland from Everton in January 2017, was suspended by the club on March 18 after being charged with drink-driving.
Gibson has not played for Chris Coleman’s side since January 1 due to injury, and the former Manchester United man’s contract was due to expire at the end of the campaign.
A statement on Sunderland’s official website read: “Following the conclusion of his recent suspension, Darron Gibson will leave Sunderland AFC by mutual consent.”
Gibson is due to appear in court on April 17.
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