'We'll talk with him in due time'
“Ilkay is one of our key players," Zorc told Bild.
"We’ll talk with him in due time on the future, but we still have a little time.
“If it was up to me, I would always insist only on long-term contracts.
"But then, Ilkay Gundogan would possibly for years no longer play here.”
The exciting box-to-box star is capable of playing anywhere in the midfield and has a contract with Klopp's old club until July 2017.
Dortmund are likely to make a hefty profit on a player they signed for just under £3million from 1. FC Nürnberg in 2011.
2011 proved to be a good year for him as he made his senior international debut for Germany in 2011 and was part of the squad which reached the semi-finals of Euro 2012.
He missed the whole of 2014 through injury including the Brazil World Cup which his fellow countrymen went on to win.