The striker limped off in the first half of the team's 1-0 loss to Egypt and was replaced by Jordan Ayew.
Speaking to Pulse.com.gh, a disappointed Gyan admitted his injury was a bad one.
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"I am in pain at the moment. I felt pain in my abductor and I knew it was bad. I will have an MRI to ascertain how bad the injury is then we will make a decision."
Gyan, who was making his 100th appearance for Ghana blamed the poor pitch at the Stade du Port Gentil.
"The pitches have been frustrating. I earlier told my players to be wary of muscle injuries because of the poor pitches and here I am a victim".
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Ghana will travel to the city of Oyem where they will face the Democratic Republic of Congo on Sunday in the quarterfinals.