The new deal will keep the 29-year-old with the Andalusian club until the summer of 2015. The new deal also includes a buy-out clause of £17.5million.
Varas said on Sevilla’s official website: “It’s an important day for me and my family.
“What has led to this situation is my work and my professionalism and I thank the club for rewarding me for the job I’ve done and for keeping confidence in me.”