Toffees boss Roberto Martinez says a decision could be made in the next 48 hours as to whether the 23-year-old needs surgery after suffering the injury during the warm-up at Chelsea last weekend.
"At the moment it is too early to have a final answer for that because obviously we don't know how long he will be out for," said Martinez. "It is important we are working together with Monaco and what we need to get right is the player gets the perfect treatment.
"The injury can be solved by conservative treatment or it can involve surgery - that is a massive decision. Depending on what route we are going down is going to have certain consequences. It could mean Lacina could play for us again or if he can't - it's a bit too early."
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