The Young Socceroos are facing dangerous 40-degree temperatures for their world youth championship qualifying match against Fiji in Melbourne on Saturday.

The Bureau of Meteorology is predicting a top temperature of 40 degrees for Melbourne on Saturday, with Australia's under-20 team scheduled to play Fiji in the hottest part of the day at 1.30pm at Bob Jane Stadium.

And there is no prospect of delaying the game until later that day, with the team having to leave Melbourne at 7pm that night on the only available flight to Fiji for Monday's second leg of the Oceania playoff.

Young Socceroos coach Ange Postecoglou played down concerns over the heat factor, saying it was something the team had to deal with.

"Obviously it's going to be pretty warm conditions, but it's been warm all week here in Melbourne and we've been training in it and getting used to it," he said.

"It (the heat) is a consideration, but you never know Melbourne weather. It might be cold and raining instead."

The national soccer league has a policy of delaying kick-offs to avoid temperatures above the mid-30s in line with the collective bargaining agreement it has with the soccer players' union.

But the Young Socceroos' tight schedule means the only option available would be to bring the game's kickoff forward to the morning to avoid the heat, something that may not suit the players' body clocks.

The Young Socceroos brought in Northern Spirit striker Adam Kwasnik to replace Dutch-based striker Mark Tsiorlas, who Postecoglou said had been struggling with his fitness.

Fiji, coached by ex-Socceroo coach Les Scheinflug, arrived in Melbourne late Wednesday and trained on Thursday.

The second leg will be played in Ba, Fiji, on Monday afternoon.

The winner of the two-legged playoff will qualify for the world youth championship in the United Arab Emirates in March.

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