Angolan billionaire businesswoman Isabel dos Santos is ready to help capitalise Brazil's Oi if her bid for Portugal Telecom SGPS , a key Oi shareholder, is successful and Oi's planned sale of Portuguese assets does not go ahead. Mario Silva, board member and spokesman for dos Santos' Terra Peregrin company that last month made a 1.2 billion euro takeover bid for PT SGPS, told Reuters on Friday her company would consider a capital increase for debt-laden Oi and purchasing Oi shares if it wins.