Volkswagen does not plan to purchase assets from its majority shareholder Porsche to help fund the latter's intended acquisition of a 75% stake in Europe's largest carmaker.

A spokeswoman for Volkswagen described as "wild speculation" a Bloomberg report quoted sources saying Porsche would sell assets to VW to raise cash based on comments from three unnamed sources.

"We can deny this," she said.

Porsche, which said in late October it had stock and cash-settled stock options equivalent to 74% of VW's votes, had difficulty rolling over 10 billion euros in loans maturing at end-March and had 9 billion in net debt at 31 January.

It only clinched an agreement with creditors after widening the pool of lenders and is now seeking a credit rating.

Porsche last reported in January that its direct holding in Volkswagen ordinary shares had crossed the 50% threshold.

The company, whose shares today clearly outperformed European auto peers on the back of the report, declined to comment on the report, as did Volkswagen's second largest shareholder, the state of Lower Saxony.

Porsche shares were up 3.1%, while the DJ Stoxx European autos index was down 2.4%.

Analysts were sceptical about the story, explaining there was little in the way of assets that Porsche could sell in the first place due to a business model that focuses on high returns and relies mainly on sports car engineering know-how as opposed to bricks and mortar assets.

"I think it's just a rumour," said Frank Schwope, analyst at NordLB. Christian Aust of UniCredit called the story "unlikely".

Metzler Bank's Juergen Pieper told Reuters he was not at all convinced Volkswagen would buy Porsche assets.

Pieper was quoted by Bloomberg in its story as saying it made sense for Porsche to gain full access to VW's cash by raising its stake.

"The whole idea appears absurd to me, too construed - as if it was an artificial birth. I do not believe it," Pieper said.