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The updated petrol price per litre is seen on a petrol pump display at a fuel station in New Delhi on January 16, 2013 (representational image).PRAKASH SINGH/AFP/Getty Images

Indian Oil Corp (IOC), the country's top refiner, will turn to its traditional oil suppliers, mostly in the Middle East, if U.S. sanctions against Iran result in supply disruptions, its head of finance said.

U.S. President Donald Trump earlier this month pulled out of a 2015 international nuclear pact with Iran, and said he would impose sanctions on Tehran - and companies that continue to work with it - unless it curbed its influence in the Middle East.

Other signatories of the pact - France, Germany, Britain, Russia and China - said they would try to salvage the deal and keep Iran's oil trade and investment flowing.

"So far we haven't cut any volumes from Iran. We have to see how strongly the U.S. takes up sanctions. From our side, we would like to continue. Otherwise we will look to our traditional suppliers," A.K. Sharma said.

IOC, which , plans to buy 140,000 bpd of Iranian oil in 2018/19 and has an option to buy an additional 40,000 bpd.

State refiners such as IOC have raised imports after Iran agreed to steep shipping discounts.

"Iran's high sulphur oil can be replaced with other crudes. It is just a case of economics. Replacing will mean slightly cost disadvantage," Sharma added.

IOC chairman Sanjiv Singh said the government had so far not directed refiners to cut imports from Iran. "We have to see how situation unfolds in future," he said.

Previously, India obtained a waiver from Western sanctions as the country had cut imports from the Islamic Republic.

"We are working on a strategy. We are working on alternate plans if those volumes go down, then how do we manage the situation," Singh said.

IOC is Iran's biggest Indian oil client. The company meets about 70 percent of its oil needs through annual contracts deals, mainly with Middle Eastern producers.

It makes sense for IOC to look for alternatives to Iranian oil from other parts of the Middle East, due to geographical proximity and similarities in the oil produced.

However, an IOC official said separately the company could also tap the spot market to buy U.S. oil. "There is an option to buy U.S. oil like Mars, but we will do that if arbitrage is favorable," the official said.

IOC recently bought 3 million barrels of U.S oil via a tender.