Diaz left Porto in January, with his former club crowned Portuguese champions on Saturday.
The Colombia winger said, "I would like to take this moment to send a very special greeting to each one and also to congratulate you on the championship.
"I am very happy, very happy. It is more than deserved, guys..
"I am very proud to have belonged to this great institution, to this great team, FC Porto. I always wish you the best and a lot of strength. A big hug to all. Come on, Porto!"
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