Oviedo sustained a terrible double fracture to his left leg in Saturday's 4-0 FA Cup win at Stevenage.
The 23-year-old had surgery on Monday but will face a battle against time to be ready for the World Cup in the summer.
The winger told The Sun: "Ever since it happened, I've been thinking about the World Cup. I have to remain calm but, in the hands of God, I will be ready for it.
"If I am back in time for the finals, then great. But, if not, then the world won't stop turning. I have already missed a tournament through injury before.
"You learn from experiences like this. You take knocks in life but the key is to be strong and to fight back."
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