(Reuters) - Ottawa must ensure the Trump administration understands how inter-related energy markets are in the U.S. and Canada, a Canadian government minister said on Thursday, following President-elect Donald Trump's threat to impose a 25% tariff on imports from the country.

"We have some work to do to make sure we are effectively articulating the way in which tariffs would be counterproductive and that's not just true of oil," Natural Resources Minister Jonathan Wilkinson told Reuters in a phone interview, adding that Americans also benefited from Canadian uranium and hydro exports.

Trump, who takes office on Jan. 20, said on Monday he would impose a 25% tariff on imports from Canada and Mexico until those countries clamped down on drugs and migrants crossing the border.

Sources told Reuters Trump does not intend to exempt crude from the tariffs, even though the United States imports around 4 million barrels per day from north of its border and many Midwestern refineries are set up to run Canada's heavy sour crude.

"There's a lot of time and effort that will need to go into ensuring that we're having the appropriate conversations," Wilkinson said.

"We have a couple of months before the president is inaugurated and I think there's time for some robust conversations between countries that are actually best friends and have both been benefiting hugely from an economic perspective because of the trade that goes between us, particularly in energy."

Canada is the world's fourth-largest oil producer and the vast majority of its crude exports go to the United States.

Earlier this year the expansion of the Trans Mountain pipeline, running from Alberta's oil sands region to Canada's Pacific Coast, gave greater access to Asian markets but the pipeline is already running around 80% full.