Roberto Martinez has explained the full extent of Bryan Oviedo's leg break.
Speaking after the 4-0 win over Stevenage, the Spaniard revealed that the Costa Rican has been taken to hospital and will have surgery on a double fracture of the left leg.
"The injury to Bryan was very unfortunate," he said. "It wasn't malicious, Bryan is trying to win the ball back and unfortunately has come away with a double fracture, a break in both the tibia and fibula.
"We are going to assess now what is the next step for Bryan. It is one of those moments that really gives you a bad taste.
"After the injury, the players had to refocus because Bryan is a nice human being and an incredible professional. When something like this happens it gives you a really bad feeling."
The injury comes as a blow to the Costa Rican who was enjoying a run in the Everton first-team.
"If you are going to pick up an injury like this, at least this season has been Bryan Oviedo's season," added Martinez.
"With his level, he has shown the quality that he has and the player that he can be.
"You feel terribly sad for him because it is a great moment in his career, with the World Cup around the corner.
"All we want is Bryan recovered as quick as we can so that he comes back as important as he has been for the squad.
"Our medical department had the final decision on whether he needed surgery and obviously that is the most important next step.
"We will find out more over the next 24 hours."