UPDATE 5-Oil prices drop as trade war concerns haunt market

* Investors edgy as await China-U.S. trade negotiations

* U.S. crude stocks likely down last week - Reuters poll

* Gazprom Neft's CEO predicts oil prices at $55-$65 in Q1 2020 (Update prices, adds WSJ report)

By Bozorgmehr Sharafedin and Roslan Khasawneh

LONDON/SINGAPORE, Dec 10 (Reuters) - Oil prices slipped for a second straight day on Tuesday as a slowing global demand outlook outweighed OPEC's deal with associated producers last week to deepen output cuts in 2020.

Brent crude was down 11 cents, or 0.2%, at $64.14 per barrel by 1445 GMT, and West Texas Intermediate oil was 14 cents, or 0.2%, lower at $58.88 a barrel.

The benchmarks fell 0.2% and 0.3% respectively on Monday.

Last week, the Organization of the Petroleum Exporting Countries and associated producers like Russia agreed to deepen output cuts from 1.2 million barrels per day (bpd) to 1.7 million bpd to support prices.

However, crude prices have fallen this week as a Dec. 15 deadline for the next round of U.S. tariffs on Chinese imports loomed over markets.

"Now with OPEC+ meetings out of the way, the market will likely focus back to trade talk developments, particularly with the 15 December deadline fast approaching," ING analyst Warren Patterson said.

U.S. President Donald Trump does not want to implement the next round of tariffs, U.S. Agriculture Secretary Sonny Perdue said on Monday - but he wants "movement" from China to avoid them.

Tamas Varga of oil broker PVM said further U.S. tariffs on Chinese goods "will have a tangible impact both on commodities and equities, at least in the immediate future."

The Wall Street Journal reported that officials from both sides were laying the groundwork for a delay of a fresh round of tariffs.

Also the growth rate of China's imports of major commodities has accelerated in recent months, indicating Beijing's stimulus efforts may be bearing fruit and that the impact of a trade war may not be as bad as feared.

But investors remained on edge ahead of other events this week, with the British election on Thursday and U.S. and European Central Bank meetings.

Gazprom Neft CEO Alexander Dyukov said on Tuesday a decision by OPEC and its allies to cut output would help support oil prices at $55-65 per barrel in the first quarter.

U.S. crude oil inventories were expected to have dipped last week, while stocks of refined products were seen higher with gasoline stocks set to rise for the fifth straight week, a preliminary Reuters poll showed.

The American Petroleum Institute (API), an industry group, is scheduled to release its data for the latest week at 4:30 p.m. EST (2130 GMT) on Tuesday, and the weekly EIA report is due at 10:30 a.m. on Wednesday. (Reporting by Bozorgmehr Sharafedin in London and Roslan Khasawneh in Singapore; Editing by Emelia Sithole-Matarise and David Evans)