Canadian media had reported that Prime Minister Justin Trudeau's government was reconsidering the sale over fears the aircraft would be used in internal security operations, just hours after both governments had announced the deal.
President Rodrigo Duterte's spokesman warned Manila may walk away from the deal in light of the controversy.
"If they don't want to sell, well, we may consider the prospect of procuring them from other sources," presidential spokesman Harry Roque told reporters Thursday.
"They must not politicise the acquisition," said Major- General Restituto Padilla, the deputy chief of staff for plans and programmes of the Philippine armed forces.
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The Philippines employs attack helicopters and planes to support ground troops battling militants in the Muslim south, as well as against communist guerrillas in other parts of the mainly Catholic Asian nation.
A Philippine defence department spokesman told AFP on Wednesday the air force would use the Bell 412EPI aircraft, worth US$234.8 million, for disaster response and humanitarian missions, but also for "anti-terrorism".
However, Padilla said Thursday this did not mean they would be used as "attack helicopters".
"Not at all. They are purely for utility purposes -- ergo, transport purposes especially during HADR operations," he said, using a military term for disaster response.
"We have separate and dedicated attack helicopters."
"These will be used to transport personnel, supplies, humanitarian missions, ferrying of wounded and injured soldiers, and other forms of humanitarian assistance and disaster response," Roque, the Duterte spokesman, said.
Bell Helicopter said the Philippine military would use the aircraft "for a variety of missions such as disaster relief, search and rescue, passenger transport and utility transport".
Trudeau said in November he had called out Duterte over "human rights, the rule of law, and specifically extrajudicial killings".
Duterte, who has overseen a crackdown that has left nearly 4,000 drug suspects dead at the hands of the police, later described Trudeau's comments as "a personal and official insult".
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