Two OPEC+ sources said they did not expect the group to agree further output cuts on Sunday, when OPEC+ ministers gather at 2 p.m. in Vienna (1200 GMT).
Before then, OPEC ministers will meet at 11 a.m. on Saturday.
As the economic outlook worsened, several members of OPEC+ in April pledged voluntary cuts starting from May, adding to a 2 million barrels per day (bpd) reduction agreed last year.
A fourth source said the idea of formalising the voluntary cuts as an OPEC+ decision was being looked at.
Last week, Prince Abdulaziz told investors he said were shorting the oil price to "watch out", which many market watchers interpreted as a warning of additional supply cuts.
Persons:
Prince Abdulaziz bin Salman, Prince Abdulaziz, Alexander Novak, Ahmad Ghaddar, Alex Lawler, Maha El, Kirsten Donovan
Organizations:
OPEC, Organization of, Petroleum, Saudi Energy, United, Thomson
Locations:
VIENNA, OPEC, Russia, Vienna, Algeria, United Arab Emirates, Russian