The Costa Rican star has signed a four-year contract and joins the Toffees for an undisclosed fee.
The 22-year-old has been granted a work permit.
Oviedo told the club’s official website: “I am so very happy. This is a very good opportunity for me.
“The last two or three days have been very stressful and tiring but I am so happy now. I am feeling good and right now everything is positive.
“I know a lot about Everton. I watch Everton games and Premier League games on the TV and it is a very good league.”
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As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?
Being an amiable guy is good for you and Jurgen Klopp is living proof.