"I'm so grateful to Real Madrid," Nacho told reporters at a Spain news conference on Thursday.
"Until a few days ago, I hadn't signed for my new club and Madrid told me they would be there if I changed my mind. I don't need a send-off like [Toni] Kroos had to realise how much I'm loved.
"I always had clear that if I didn't finish my career at Madrid, I wouldn't want to play against them. I want to experience something new, something different. My life is going to be turned upside down but that's what I want. I'm very happy."