Ontario's municipal affairs minister says key concerns such as ridership and affordability must be addressed before any more provincial money is committed to Ottawa's multi-billion dollar transit plan.

"We don't want to set the city up for failure. So we want to take the time to properly analyze their plan," Jim Watson told CTV Ottawa.

"We just got the request a few days ago and I think it's reasonable to wait for a couple of months while we do our work with professionals in the Ministry of Transportation," he said.

The city has already tripled its request for its new $3.2-billion transit plan, which includes building a downtown tunnel and light rail transit from Blair Road to Tunney's Pasture.

The city is now asking the federal and provincial government to each pitch in one-third of the cost.

The federal government has already said it is willing to commit some funds to the project.