Andalusian club said the former Arsenal midfielder has agreed a contract for three years until the 2014-2015 season. They did not mention transfer pricing, which was previously reported to be worth 4.5 million dollars plus a bonus number.
Reyes, who left Seville in 2004 that could harm Arsenal around 39 million dollars, saying the less chance of playing after helping Atletico won the Europa League and European Super Cup in 2010.
28-year-old player, a former member of the Spanish national team and could join Real Madrid and Benfica, only played nine times for Atletico this season.
Meanwhile, Britain announced it would conduct a friendly against Norway and Belgium as the final preparations to Euro 2012.
English Football Association said on Thursday the national team will face Norway in Oslo on 26 May and returned to Wembley to meet Belgium on June 2.
After that, the team will travel to Krakow, Poland, one of the two countries host Euro 2012. English is a group with France, Sweden and Ukraine. Euro 2012 begins June 9.
England has won five times out of 10 match against Norway, and only ever lost once in 20 meetings with Belgium.