France coach Didier Deschamps is refusing to let Les Bleus rest on their laurels after the 1-0 victory over Bulgaria, with one more win required to book their ticket to the 2018 FIFA World Cup in Russian Federation next summer.
There is also history between the two nations, as the last time France failed to qualify for the World Cup was in 1994 following a late defeat to Bulgaria in qualifying.
"We're still first - that's important - we've got one match left and [qualification] remains in our hands, so we have to win [tomorrow]".
"It was a hard match with lots of mistakes, commitment", said coach Deschamps.
Belarus equalised through Maksim Volodjko.
All that means that the Netherlands are all but certain to miss out on a second consecutive major tournament despite a 3-1 win over Belarus.
Sweden have a vastly superior goal difference, and the Netherlands' - runners-up three times -participation in Russian Federation looks highly unlikely.
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Lacazette should have doubled France's lead just before the 30-minute mark after being found inside the Bulgarian box by Mbappe, but the Arsenal forward was denied by a brilliant challenge from Vasil Bozhikov.
Clearly content to settle for a 1-0 win, France offered nothing in the way of attacking intent in the second half.
Ahead of the clash with Bulgaria, the 1998 World Cup victor told the French media: 'Since the start, we know that this is a very important match for us.
Group H winners Belgium battled to a 4-3 away victory over Bosnia-Herzegovina, in a match which saw Manchester United midfielder Marouane Fellaini go off with what could prove a serious knee injury. On Saturday they travel to Bosnia-Herzegovina, who are second in the group and looking to improve their chances of qualifying for the play-offs as one of the best eight teams. "When you have good players, it's normal to expect us to make the difference".
Steven Zuber scored twice in Basel as Switzerland made it nine wins from nine by thrashing Hungary 5-2.
Goalkeeper Hugo Lloris had little to do until the 37th minute when he was called into action twice in a matter of seconds.
Thomas Meunier had put Belgium in front after just four minutes, but goals from Haris Medunjanin on the half-hour and Edin Visca after 39 minutes put the hosts ahead going into the break.