Borussia Dortmund chief Michael Zorc admits there's been little progress in attempts to open new contract talks with Robert Lewandowski.

The Poland international is a top target for Manchester United, with media sources in Germany, England and Poland all declaring Lewandowski will move to Old Trafford in the summer.

"We are in constant dialogue with his advisers," said Zorc.

"Right now we have the situation that an extension in the near future does not dominate, but Robert's contract does run to 2014."