The Spanish outfit, who recovered from a goal down to win 2-1 in Portugal, ended Porto's five-year unbeaten run at the Estadio do Dragao.
"Without doubt, winning at Porto is a really great victory. They are a great team and they have won a lot of titles. I am really pleased with the work of all my teammates. It is a very happy night," Rodriguez told reporters at a press conference.
"In the first half it was tough as Porto pressed us hard. In the second half it was a lot better. It is true that this will always be a second home for me.
"I was here for four years and lucky enough to experience some great moments, winning a lot of titles. I still have a lot of friends here."
Rodriguez spent four years with Porto from 2008 to 2012.