Toronto FC coach Greg Vanney says the freezing forecast in Colorado could make the field "dangerous" for players in Tuesday's CONCACAF Champions League opener.
The Colorado Rapids will host Toronto in the first leg of the round of 16, and the National Weather Service has issued a Hazardous Weather Outlook for the area over the coming week.
The forecast for Tuesday calls for an overnight low around 6 degrees Fahrenheit, with a wind chill as low as minus 1 and a 20 percent chance of snow.
"In France you get frozen fields and they start to become dangerous," Vanney told the Toronto Sun. "You're essentially playing on concrete. That's where it potentially becomes an issue... The field can get dangerous."
The gametime temperature is likely to easily surpass the coldest MLS game, when Minnesota hosted Atlanta in 19-degree weather last March.
But despite involving two MLS teams, Tuesday's game will be run by CONCACAF, and Vanney lamented the lack of options for cold weather from the regional governing body.
"It seems like [CONCACAF] doesn't have any set rules for weather," Vanney said. "It's going to be a discussion. 'What does it mean? What does it look like?'"
And Vanney admitted the cold could affect Toronto's tactics in the first leg, adding: "You kinda go with it, you deal with it. Again, safety is the most important thing here.
"We'll make an appropriate decision based on that. Then the soccer can be played after that."
The Sun reported that Toronto defenders Chris Mavinga and Gregory van der Wiel will not travel with the team, which could force an immediate debut for new Brazilian signing Auro in the challenging conditions.