REUTERS/Dado Ruvic/File Photo Acquire Licensing RightsLONDON, Nov 21 (Reuters) - An OPEC technical panel invited a top financial market dealer to give a presentation this week which painted a bearish outlook for the oil market, according to materials from the presentation seen by Reuters. OPEC - the Organization of the Petroleum Exporting Countries - did not immediately reply to a request for comment. London-based Onyx Capital Group is the world's biggest market maker by volume across oil swaps, trading more than 25 billion barrels equivalent a year. The second sell-off, which happened in November, moved the oil market to a collective neutral-to-bearish sentiment, with commercial participants like oil producers and airlines joining financial speculators in seeing a weak outlook. Ministers from OPEC and allies led by Russia, a group known as OPEC+, are due to meet on Sunday to decide on output policy.

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Persons: Dado, Greg Newman, Brent, Prince Abdelaziz bin Salman, OPEC's, Onyx, Goldman Sachs, Dmitry Zhdannikov, Jan Harvey Organizations: REUTERS, Reuters ., Onyx Capital, OPEC, Organization of, Petroleum, Onyx, Twitter, Reuters, Saudi Energy, Economic Commission Board, ECB, JPMorgan, BNP, Thomson Locations: OPEC, London, Russia, Saudi Arabia, UAE, Iraq, Kuwait