During Thursday's meeting, OPEC leaders are expected to discuss how to stabilize crude oil production after US prices plunged by 22-percent in November - making it the worst month since the financial crisis in 2008.
Saudi Arabia has been calling steep cuts in oil output and was expected to raise those demands during the meeting, but pressure from the USA may convince Saudi leaders to take a softer tone.
Saudi Arabia has indicated it wants the Organization of the Petroleum Exporting Countries and its allies to curb output by at least 1.3 million barrels per day, or 1.3 percent of global production.
USA special representative for Iran, Brian Hook, met with Saudi Energy Minister Khalid Al-Falih in Vienna on Wednesday, according to a person familiar with the matter. Most producers made clear they agree on the need for a cut in oil production.
Iranian oil minister has lashed out at United States special representative for Iran Brian Hook over his "meddlesome" meetings with members of the Organization of Petroleum Exporting Countries in Vienna, asserting that OPEC is an independent body that does not take orders from the US.
In private conversations earlier this week, OPEC delegates said that Russian Federation and Saudi Arabia still differ on how to share the cuts.
Donald Trump has often complained about OPEC this year as higher crude oil prices have raised fuel cost.
The possible deal will come after some OPEC and non-OPEC members motivated by an urge to get a better market share sharply increased their oil production, which led to a $30 drop in oil prices from their highest point. Saudi Arabia, Russia and the UAE have raised output since June after Trump called for higher production to compensate for lower Iranian exports due to new US sanctions. "The World does not want to see, or need, higher oil prices!" Trump wrote in a tweet on Wednesday.
Possibly complicating any OPEC decision is the crisis around the killing of journalist Jamal Khashoggi at the Saudi consulate in Istanbul in October. So he wants low prices now. Official U.S. government oil production and inventory data are also due on Thursday.
The Nopec legislation being discussed by USA lawmakers could make it possible to sue Saudi Arabia and other OPEC members for price fixing.
"Nobody wants to mention a number, because it means you're committing yourself to how much you're going to cut", said Al Rumhy.