Calgary's city administration says a decision should not be made on bidding for the 2026 Winter Games until the costs of doing so are better understood.

A report highlighting some of the unanswered questions surrounding a potential bid is going before this week's council meeting.

It echoes a bid exploration committee's conclusion last week that it's feasible for 1988 Olympics host city to have another turn, but it can't say yet whether it would be prudent.

Municipal bureaucrats say right now it's impossible to predict the risks of a bid.

Some of the unknowns include details of the 2026 bid process, what is in the yet-to-be-released host city contract and how other orders of government and the International Olympic Committee may be able help offset the costs.

The administrators' report also raises concerns about the city exceeding an appropriate level of debt if it were to move forward with a bid.