BSkyB is looking to buy Sky Deutschland and Sky Italia in a 10 billion euro (7.98 billion pounds) deal that would realise long-held ambitions by media magnate Rupert Murdoch to combine his European TV assets.

The potential tie-up would create a pan-European giant with 20 million subscribers.

According to the source, both banks already act as advisers to the broadcaster and are being retained for the proposed transaction.

The latest proposal would see BSkyB, 39 percent owned by 21st Century Fox, buy Sky Italia and Sky Deutschland, which are 100 percent and about 55 percent owned by Fox, respectively.

BSkyB said in May that talks were still preliminary and no agreement had been reached on terms, value or transaction structure.

"BSkyB believes at the right value, this combination would have the potential to create a world-class multinational pay TV group," the group said.

(Reporting by Chris Vellacott; Editing by Jane Barrett and Stephen Powell)