Rais Yatim said he had been asked to pay for votes in an upcoming contest for top posts, and warned that money politics would destroy the organisation.
Foreign Minister Rais Yatim said "the majority" of Umno members were more interested in making money out of the election than in voting for the right person.
"The majority of Umno people want to look for money and not for good leaders," said Rais, a member of Umno's decision-making committee who is vying for the vice-presidency.
"We have been approached under the cloak of assistance and cloak of contribution. (But) I'm not a player so you don't see my marks going up very high.
"If you want to be a good player, you have to say yes (to vote-buying)," he told reporters.
Rais, who has been with Umno for over 33 years, said the problem of money politics within the ruling party should be eradicated or it "will surely kill the party."
Old habits die hard. You can't find a cure for money politics. It is entrenched and calcified within the system. Live with it, whatever, dear Rais.