France coach Didier Deschamps has conceded his side's World Cup hopes have suffered a severe setback after Friday's 2-0 defeat to Ukraine, but insists Les Bleus must believe they can get a result in the second leg.
Second half goals to Roman Zozulya and Andriy Yarmolenko gave the Ukrainians a strong advantage heading into the return fixture at the Stade de France on Tuesday.
But Deschamps is confident the home ground advantage could play into France's hands.
"It was a fight. We had a lot of opportunities," he told TF1. "But the first goal gave them more strength. We made a mistake on the penalty.
"Obviously this is a very bad result for us. But we have to believe. The best position is that of Ukraine who have it today but we still have 90 minutes with us at home."
France will be without Laurent Koscielny, who was sent off in injury time to cap off a miserable second half for the Arsenal defender, while Ukraine's Oleksandr Kucher is also suspended for the match.