The Desert Foxes, who also have England and the United States in their group, have come in for criticism after four consecutive friendly defeats in the build-up to the finals - the latest against the Republic of Ireland last Friday.
But Wolfsburg playmaker Ziani has defended the team, saying that not too much should be read into those results. The north Africans have one final chance to impress before the tournament begins when they play United Arab Emirates on Saturday.
"I think the most important game is the one against Slovenia," he told www.competition.dz. "This match against the Emirates will be a preparation match for that game. If we win against the UAE and lose to Slovenia, there is no point."
Looking back on the 3-0 loss to the Irish and the current run of Rabah Saadane's team, he added: "We cannot be judged on this game, especially considering that there were some players that had never played together before.
"We also had lots of injuries. I am not particularly worried about these four losses because we didn't play at full strength. As I said they were just a warm-up game and the most important thing for now is Slovenia. Everyone is highly motivated to make it a good World Cup."