* Market focuses on oil supplies, OPEC meeting on June 22
* U.S. weekly crude inventories expected to fall -Reuters poll (Adds details, updates prices)
By Jane Chung
SEOUL, June 5 (Reuters) - Oil prices rebounded on Tuesday on expectations that inventories in the United States may decline, but increasing U.S. production and concerns that OPEC may raise output continue to weigh on sentiment.
Brent crude futures added 25 cents, or 0.33 percent, to $75.53 a barrel by 0717 GMT, after settling down 2 percent at $75.29 on Monday.
U.S. West Texas Intermediate (WTI) crude was up 44 cents, or 0.68 percent, at $65.19 a barrel. It finished the previous session 1.6 percent lower at $64.75.
"It's all about supply, whether it's OPEC raising output or U.S. increasing production, all roads lead to higher global oil supplies, which is leaving oil traders shaking in their boots," said Stephen Innes, head of trading for Asia-Pacific at futures brokerage OANDA in Singapore.
Reuters technical analyst Wang Tao said Brent may test a support at $75.05 a barrel, while WTI may test a support zone of $64.33-$64.41.
"The gains are seen to be a technical rebound from the last session's losses, but the market's focus is on the OPEC meeting and how much Saudi Arabia and Russia would increase output," said Kim Kwang-rae, commodity analyst at Samsung Futures in Seoul.
The Organization of the Petroleum Exporting Countries (OPEC) is due to meet in Vienna on June 22 to decide whether the group and non-OPEC producers, including Russia, will raise output to ease concerns over potential supply shortfalls from Iran and Venezuela.
Over the weekend, OPEC and non-OPEC Arab oil ministers agreed on the need for continued cooperation to balance global supply, Kuwait's state news agency KUNA reported.
Despite signs of an impending rise in OPEC production, "for the moment the output will remain low," ANZ bank said in a note on Tuesday.
Global oil supply has tightened with the OPEC-led production cuts that began in early 2017.
Crude stocks in the United States, the world's biggest oil consumer, were forecast to fall about 2.5 million barrels on average in the week ended June 1, according to five analysts polled ahead of the reports.
But increasing U.S. crude oil production has also put pressure on oil prices.
In March, U.S. crude output rose to 10.47 million barrels per day, the highest on record, according to a monthly report by the Energy Information Administration (EIA).
The number of rigs drilling in the United States was up by two in the week to June 1, bringing the total to 861, the most since 2015, General Electric Co's Baker Hughes energy services said on Friday.
Industry group American Petroleum Institute (API) is due to release its data for last week's U.S. crude oil inventories at 2030 GMT on Tuesday. The EIA report is scheduled at 1430 GMT on Wednesday.
Additional reporting by Roslan Khasawneh in SINGAPORE; Editing by and Christian Schmollinger and Tom Hogue