Costa Rica lost to Germany in their opening game of the tournament.
Costa Rica, who showed a lot of urgency in their attack in the beginning, gave a good account of themselves before losing through substitute Noah Awuku's late goal.
"Now, we have no option but to win against Guinea tomorrow to remain in contention for the knockout stage. The Africans are physically strong and we need to overcome them with our skillful ball play which we are known for.
Guinea will be without their key defender Cherif Camara, who got a red card in the last match. They will be looking for a win to keep their hopes alive.
They looked impressive against Iran in the first half and had several chances that went abegging. They were over ambitious in their attack in the second half and left their defence exposed, which Iran capitalised.
The Africans conceded a penalty and were down to 10 man when Camara was sent off for a harsh tackle.
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