A temporary chicane was inserted between the hairpin and the Casino corner on the back straight, so as to decrease top speed and increase safety in the wake of Ayrton Senna's fatal crash at Imola. Teams had also been ordered to cut holes in the airboxes on the back of the cars, so as to decrease the 'ram air' effect and thus decrease engine output. As the FIA did not standardize where the holes had to be cut, each team interpreted the rule in different ways. Teams were also running on 'pump fuel...
Simtek entered only one car for Canada, following the injuries to Andrea Montermini at the previous race in Spain . Andrea de Cesaris replaced the injured Karl Wendlinger at Sauber , and would thus make his 200th Grand Prix start at Montreal.