Diaz's €75m move to Bayern Munich was confirmed this morning.
After the initial announcement, in a post to social media, Diaz stated: "Three years and a half that I’ll treasure forever. I arrived with all the dreams in the world, and I am leaving proud of everything we achieved together.
"I have met incredible people, fabulous colleagues, coaches who helped me a lot, and extraordinary fans. Liverpool is, indeed, a special team, and I will keep everyone in my heart. The cycle ends here, and it is so gratifying to look back and realize how happy we were.
"Not only because of the trophies we won, but for the union and friendship that made it all possible. There were ups and downs, as there always are, but there was always truth. As it should be in a family."
In his statement, Diaz also turned to the tragic loss of former teammate Diogo Jota after his fatal car accident earlier this summer.
He continued "It’s good to be leaving with the feeling of a duty fulfilled, and, most of all, to be leaving a champion. It would have been the perfect goodbye if we hadn’t lost one of ours in such a tragic way.
"As I said, and I repeat, I carry everyone with me in my heart, but one of them in particular: Diogo. I will never forget him. We will never forget him. Thank you for everything. YNWA."