Gundogan is currently out with a back injury and Borussia Dortmund are keen to resume negotiations over a new deal when the Germany international has recovered from his problem.
Gundogan has been strongly linked with the likes of Real Madrid, Arsenal and Manchester United in recent months.
“Of course, we are very interested in signing a new contract with Ilkay Gundogan,” Zorc told kicker-Sportmagazin.
“Due to the injury that Ilkay Gundogan is out with at the moment, talks regarding a new deal have stalled, but we are keen to soon resume negotiations on a new contract.”
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.