The match in Port Elizabeth could dictate who advances from a tough section that also features five-times World Cup winners Brazil and the tournament's most mysterious side North Korea.
Portugal have a lot to prove after a patchy journey to the finals and doubts remain over whether the influential Pepe is ready to start after a lengthy injury layoff.
There are also question marks about Cristiano Ronaldo's ability to replicate his potent performances with Real Madrid at the World Cup after mediocre displays in the qualifiers.
"The Ivorian squad is made up of some world class players but football remains a team game," Toure said. "Since he has taken over the squad, the coach has been trying to build a proper team and we are on track."
Portugal's 30-year-old winger Simao Sabrosa is desperate to start and eager to dispel doubts about his pace after a draining 70-game season with Atletico Madrid and the fine form of his possible replacement Danny in recent warm-up games.
Simao insists he is worth a start in Tuesday's match in the blustery coastal city, which he said could go either way.
"We will enter as a strong, positive team. It depends on the first minutes. It will be a tactical game and I think the team that has the most possession will win," Simao said.
"We believe in ourselves. We had lots of problems reaching this World Cup, so we want to make the most of it."
