Borussia Dortmund chief Michael Zorc insists they're under no pressure to sell Mats Hummels this summer.

The Germany international is a top summer target for Manchester United.

But Zorc says: "As far as I know, Hummels' contract still runs to 2017.

"We have not received any bids that we should consider seriously.

"There will definitely be some changes in the team this summer. Perhaps more changes than in recent years. But we cannot completely replace our team."