The Borussia Monchengladbach sporting director Max Eberl has admitted their defensive midfielder may leave this winter.
The 25-year-old is out of contract in the summer, and can sign with any team on a free transfer at the end of this season.
He told Kicker: "There's nothing on my desk.
"It's not surprising that there is speculation about both of them [Zakaria and Matthias Ginter] and especially Denis, but it's no longer our topic.
"They both still have a half year of contract. But we have also said again and again that if something comes up that we have to deal with for financial reasons.
"I cannot rule out that both will leave the club in winter - or one.
"There will be changes in the summer. We've worked with one squad for almost three years now."
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