The U.K. government fears that its post-Brexit trade deal with Canada will not come into force in time to prevent tariffs being imposed between Britain and its 12th-largest trading partner from Jan. 1.

The agreement is yet to be approved by the Canadian parliament which rises for its recess on Friday, and that is causing deep concerns among U.K. officials, according to a person familiar with the matter, speaking on condition of anonymity.

Britain and Canada announced an accord in principle in November, agreeing to roll over the terms of the EU-Canada free-trade agreement which the U.K. benefited from when it was a member of the bloc. Without the continuity deal, bilateral trade worth about 20 billion pounds ($27 billion) would face World Trade Organization tariffs, starting next month.

Canadian Trade Minister Mary Ng introduced the bill in the Canadian legislature on Wednesday. However, the Canadian parliament’s last scheduled sitting day is Friday, according to its schedule, leaving just two days for parliamentarians to debate and pass the proposed deal.

If lawmakers in Canada’s House of Commons manage to approve the deal by Friday, it then needs to be approved by the Senate before it can become law. The Senate’s last sitting day is scheduled for Dec. 18, according to its calendar.

If the bill gets blocked, businesses could have to pay tariffs for at least a few weeks, with lawmakers set to return on Jan. 25. However, two Canadian officials said the government may seek out regulatory mechanisms that could mitigate the problem in the short term.

“As Minister Ng said yesterday, we are actively working with the U.K. on contingencies to ensure a smooth transition for Canadians and workers with no disruptions, and will have more to say on this soon,” Youmy Han, a spokesperson for the trade minister, said in an emailed statement.

The U.K.’s Department for International Trade declined to comment.

Agriculture is one of the affected industries. If the agreement is not passed in time to prevent tariffs, pork producers are looking at possible short-term adjustments such as delaying shipments or absorbing or sharing increased costs with customers, said Gary Stordy, a director of government and corporate affairs with the Canadian Pork Council.

Canada exported 317,000 kilograms (699,000 lbs) of pork to the U.K. last year and imported 372,000 kilograms of pork from the U.K., Stordy said.

The Canadian Cattlemen’s Association said Wednesday that achieving a long-term free trade agreement with the U.K. is its highest priority because Canadian beef producers continue to face hurdles to export to the U.K. In 2019, Canada exported 1,584 metric tons of beef to the U.K. and imported nearly twice that amount from the country, the group said.