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The Chelsea midfielder hurt his right knee in a tackle with teammates as Ghana were preparing in the Angolan capital for Tuesday's key Group B match against Burkina Faso.
He is now in doubt for a match that Ghana must win to stay in the competition, and could be sidelined even longer if the initial serious nature of the injury proves to be true.
"He was taken to a local hospital for a scan and we'll get the results back on Monday," Ghana's team press officer Randy Abbey said on Sunday.
"We will then have a clearer idea of whether he can play."
Essien was brought on for the second half of Ghana's 3-1 loss to neighbours Ivory Coast in Cabinda on Friday, but obviously still struggling with the injury and his fitness as he made little impact on the game.
