The Pamplona-born 31-year-old, who will be presented by his new club on Wednesday, has penned a two-year contract with Zaragoza.
Lopez Vallejo came up through the youth ranks at Osasuna before joining Villarreal in 1999. He spent last on loan at Recreativo Huelva.
© Copyright PA Sport 2007, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: https://www.givemesport.com/writeforgms