Iniesta has struggled with a string of muscle injuries this season and was substituted in the second half of the shock 1-0 defeat to the Swiss after a crunching challenge. Del Bosque said he was the only one of the 23-strong squad not at 100 percent.
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"We have all the players available except Andres Iniesta who is not fully fit," Del Bosque told a news conference at Ellis Park Stadium where the Group H match will be played.
"He has a sore spot, but if he had to play he could and we have time tomorrow to decide."
"Perhaps we have to be more decisive in the final phase of attacks," Del Bosque said.
"But every day we are seeing more evidence of how evenly matched the teams are at this World Cup.
"No team will give you space and it's hard to exert superiority over any opponent."
"Every coach has their style and way of working and (Del Bosque) is making sure that all the players are fully focused and nobody switches off," he said.
"The team is really fired up after the setback the other day," he added. "We have to stay calm and not get anxious and just play the way we know."
