Ter Stegen has a contract at Borussia Park until 2015, but attempts to get him to sign a new deal have been rejected, according to sporting director Max Eberl.
The club announced the news from Eberl on its official Twitter account, posting: "Ter Stegen will leave Borussia. Marc has informed us that he will not accept our offer."
Ter Stegen has kept six clean sheets for Monchengladbach this season, helping the team climb to third in the Bundesliga.
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