VfL Wolfsburg's plans to upgrade Kevin de Bruyne's contract could be scuppered by sponsors.

De Bruyne remains on the shopping lists this summer of Manchester City, PSG and Bayern Munich.

Wolfsburg chief Klaus Allofs has hopes of securing De Bruyne's commitment by tying him to a new, improved deal.

However, plans to up his salary from €5 million to €8.5 million could be blocked by sponsors Volkswagen, says BILD.

A shareholder of the auto giants complained in May about their commitment to VfL and the club's big spending. News of a massive pay-rise for De Bruyne could create further problems for Volkswagen with their shareholders.

Belgian sources, meanwhile, say City and De Bruyne's camp have had "informal contact" over the past fortnight.