The 23-year old Costa Rica international broke his leg in two places during the weekend's FA Cup win over Stevenage and has since had surgery as he gets set to being rehabilitation in a bid to get himself fit for this summer's World Cup.
"Bryan's surgery was a big success and he is in a comfortable and stable condition," Everton's head of medical services Danny Donachie told the club's official website.
"He fractured his tibia and his fibula and they were displaced, so we weren't able to put them back into place until Monday. He had surgery last night when a rod was put through his tibia, which means he will come back stronger than before.
"It was a clean break and that means that there are no pieces of bone. Sometimes when there are small fragments of bone in the area, it can be difficult to deal with. But these are clean breaks, so they will put the bones back into position and it will heal well from there.
"We will be working hard to get him back as quickly as we can."
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