The 31-year-old midfielder is on the mend from a hamstring injury that he picked up during his club’s final Premier League match against West Ham last month.
After more than a week’s treatment at the Aspetar Sports Groin Pain Centre in Qatar, Toure rejoined the group in Dallas, Texas, where preparations for the tournament had long begun.
He did not feature in the two warm-up matches against Bosnia-Herzegovina and Salvador, and was made to undergo private training sessions during the period.
Arriving in Sao Paulo, Brazil on Friday, the Ivorian delegation looked enthusiastic, but coach Sabri Lamouchi admitted that Toure might not be fit for the start of the World Cup.
“He ended the season with difficulties,” he told Jeune Afrique. “He is yet to fully train with the group but he’s currently responding to a healing protocol.
“We will do our best to make him fit to play against Japan in our opener. He might start or come in as a substitute. I can’t really tell for now."