Should the unlikely happen and Schumacher is declared unfit, Junqueira will take his place in the Williams car.
BBC: Schumacher hopeful for Montreal
Da Matta had to abort his final lap to prevent him crashing into the prone Team Target car of Junqueira.
BBC: Junqueira on Cart pole
Bruno Junqueira qualified first for the Motorola 220 despite hitting the wall on his final lap at Road America in Wisconsin.
Junqueira knocked Da Matta off the top spot just one minute from the end with a lap of 1:42.151 at 142.659 mph (229.538 kph).
Mexican Michel Jourdain and Brazil's Bruno Junqueira share third at 74.
BBC: Franchitti ends victory drought
Schumacher missed testing at Monza in Italy in the run-up to Montreal and Brazilian Bruno Junqueira - who missed the Williams berth in a drive-off with Jenson Button - stood in for him.
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