Tengku Razaleigh Hamzah said Umno should be in a dominant position after the next general election or there would be political instability.

"Bersatu shouldn't come into the picture. They (Umno members) feel it should be just Muafakat (Nasional) - PAS and Umno - along with traditional partners of BN (which are) MCA and MIC.

"Then you won't have much of a problem in terms of allocation of seats.

"But if you bring in Bersatu, we may face an election (outcome) that would put us in a hung situation again - nobody in a dominant position and nobody with a clear majority.

"Then we are going to have a very unstable situation," the 83-year-old Umno advisor, who is now in his eighth-term as the Gua Musang MP, told Channel News Asia.

Asked if he believed Umno would continue to support Muhyiddin Yassin as the prime minister after the next general election, Tengku Razaleigh disagreed.

"I don't think so. The arrangement in Perikatan Nasional (now) is purely to ensure stability.

"When we face the general election, it is a different ball game. Umno will have to get its act together (before then)," he added.

Tengku Razaleigh believes that Umno's chances in the next election are bright but was unable to name a possible candidate for prime minister.

"That is the big question. What Umno and BN have to decide is to hoist a person that can lead. One with integrity.

"Those who were leaders yesterday must be prepared to sacrifice themselves and give way to new people who are not tainted," he added.

There are question marks over whether PN - formed on an ad hoc basis in March - would survive until the next general election, which must be held by 2023.

All three parties faced off against each other during the 2018 election, which saw Umno coming on top.