"I felt a knock and it's a bit swollen, but I don't think it's too serious. By Friday I'll be ready," he told reporters after a lengthy training session at Mogwase, near the team's Sun City base.
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Missing from the session were captain John Mensah, midfielder Kevin-Prince Boateng and winger Dede Ayew, who all picked up knocks in the weekend's second round win over the United States.
Gyan, who has scored three of Ghana's four goals at the finals, said reaching the last eight was a massive achievement for the Black Stars.
"We are so happy to have qualified, it was so important for Ghana and the whole of Africa. We qualified for second round four years ago and this time we've made it to the quarters."
It was Gyan's spectacular extra-time volley that proved the winner in the 2-1 victory over the Americans at Rustenburg on Saturday.
"The goal was one of the best of my career. I was pushed from behind and I should have fallen down (to claim a penalty) but I resisted and I made it happen."
Thoughts of targeting the tournament's top scorer award, however, were not on his mind, he told Reuters.
"I'm only thinking about helping my team to win. The prize is not important, remember football is a collective game."
