Ghana captain John Mensah could not train with the Black Stars on Wednesday morning because of injury.
The defender suffered the thigh injury during Tuesday's 1-0 win over Botswana at the 2012 Africa Cup of Nations Group D match in Franceville. He will undergo further tests on Wednesday afternoon to determine the extent of injury.
"We will take John Mensah to the hospital this afternoon for MRI scan to find out the severity of the injury," Ghana team doctor Percy Annan told Ghanafa.org.
"He has some pain in this lower left thigh and that is why he is not training today."
Mensah played through the pain barrier during the match against the Zebras before he was sent off.
Ghana will play their next Group D match against Mali in Franceville on Saturday.