More than 3,000 of former prime minister Najib Abdul Razak's supporters have converged outside the Kuala Lumpur court complex.

Clad either in red or blue, many bearing the familiar "bossku" phrase on their T-shirts as a sign of reverence for their leader, these supporters came from all over the country.

One of the women from Najib's Pekan constituency says they travelled through the night, arriving at the court complex at 5am.

The verdict of the criminal trial of Najib involving the alleged abuse of power and money laundering of 1MDB funds will be delivered today at the High Court in Kuala Lumpur.