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The club refused the services of goalkeeper Craig Gordon, who cost 11 million euros in 2007.
The footballer, acquired from Edinburgh Hearts five years ago, suffered from injuries and later failed to regain good athletic form.
Along with Gordon, Liam Bagnall, Jordan Lavender, James Brace, Brett Elliott, Jordan Cook, and Oumare Tounkara also left the team.
Recently, Simon Mignolet was the main goalkeeper for Sunderland, with Keiren Westwood as the backup.
