Prime Minister Justin Trudeau is expected to confirm on Thursday that the federal government will help finance Montreal's metro extension, multiple sources have told The Canadian Press.

The sources spoke on condition of anonymity because they weren't authorized to talk publicly.

Trudeau is to be joined for the announcement in east-end Montreal by Mayor Valérie Plante, Quebec junior transportation minister Chantal Rouleau, and federal Heritage Minister Pablo Rodriguez.

The federal money would help finance the $4.5 billion project to extend the city's blue line by five metro stops, from the St-Michel station towards the Anjou borough.

Construction is expected to begin in 2021 and be completed in 2026.

Ottawa usually finances roughly 40 per cent of the total cost of infrastructure projects across the country.

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