Neto waved goodbye to Valencia fans with an emotional message on Instagram. The Brazilian keeper signed for Barca for 35m euros for the next four seasons.
Barcelona and Valencia effectively swapped stoppers with Jasper Cillessen going back the other way for the same fee.
"Two years ago I arrived at Valencia with the objective of getting them back into the Champions League," wrote Neto. "I dedicated myself to that, working to give my best, and I delivered in this project that only a few people believed in, and I did it. I did it with my team-mates, not just once, but twice. But life is about cycles and new challenges.
"Today I saw goodbye with my head held high and the feeling that I completed things with you, Ches. I take with me all these experiences, the birth of my daughter, the friends I made and the love I had. Thanks for these years, Valencia, for the support I received, care, and conquists that we had together."