Vidal has joined the Spanish outfit on a four-year deal after three impressive seasons at Almeria.
The quick winger wants to continue his progression and feels he can do that at the Seville-based club.
Vidal told the club's official website: "I've been living the dream for the last three years in La Liga.
"But this opportunity was one I couldn't pass up.
"I only have words of thanks for Almeria, who have helped me enormously in my career.
"But I am still young and I can improve – and I hope to do that here in Seville.
"I appreciate the opportunity that has been given to me and I want to repay the president and the coach, who believe in me. I feel great here already."
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