Mexico coach Jaime Lozano admits it's too soon to assess the injury of Edson Alvarez.
The West Ham midfielder was forced off during El Tri's Copa America win against Jamaica.
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Lozano says Mexico's medical team will need a few days to fully know the extent of Alvarez's injury.
He stated: "We have to wait a few days to carry out investigations on him and to know what has happened."
Mexico's next assignment is against Venezuela on Thursday.