Toure went down grabbing at his left calf then waved to the trainers soon before the second half drinks break in the 68th minute, in Australia's brilliant 2-0 win
It appeared to be just cramp, with Turkish opponent Merih Demiral helping Toure to stretch out, but the striker was replaced by Tete Yengi soon after the restart, in the 74th minute.
"I thought it was worse than it was, because it just came out of nowhere, and it could be a tear," he said.
"So now have to see what happens.
"I'll ice it up and we'll see."
When asked if he thought there was cause for concern Toure, who has a history of soft tissue injuries, said: "It's a bit sore now, so we'll see in the week off."
Coach Tony Popovic said there were no injury concerns out of the game, but the Socceroos boss tends to keep his cards close to his chest.
Australia will hope Toure's issue is purely cramp-related, rather than any sort of strain, given his importance to their attack.
Last week, there were plenty of nerves after Toure missed training on Wednesday with what Popovic said was a runny nose, but he recovered in time to start.
Toure impressed against Turkey with his clever runs and dribbling, especially early, and will again be important in Friday night's (Saturday morning AEST) clash with the United States.
The striker was "surprisingly" not nervous and credited Australia's pre-tournament camp for having the Socceroos in the physical state to see out the tough clash.
"We've worked towards it, so I knew we were ready physically. It just was a challenge mentally and I feel like we accepted the challenge and we stuck to the game plan
The 22-year-old feels the Socceroos, including close mate Nestory Irankunda, can properly announce themselves on the world stage this month.
"We have a great group of boys, very talented," Toure said.
"A lot of people say we're too young, but I feel like we have a game plan, and we can stick to it. We can get results."
