"Any option you can think of would be an option," Pfizer CFO Frank D'Amelio told the Reuters news agency.
He said he had met with a small number of AstraZeneca heads in London, host to the company's headquarters, and said that Pfizer's offer of £50 a share was "compelling". Reuters reported, however, that analysts thought Pfizer might have to go up to £52 to £55 pounds to get the Anglo-Swedes to bite.
Story continues below…
D'Amelio, who said Pfizer was very disappointed at the unwillingness to enter into talks, said he did not rule out a hostile takeover bid on AstraZeneca.