Former prime minister Muhyiddin Yassin should stop laying hope that Umno will cooperate with Bersatu in the upcoming 15th general election, said Umno Veterans Club secretary-general Mustapha Yaakub.

Umno, he said, is ready for the possibility of a clash with Bersatu.

"We have decided to sever ties. Be prepared to face it. Only the best will win," he told Malaysiakini.

Mustapha was responding to a Bersatu leader who said his party would not be affected should there be a clash between ruling parties.