The 30-year oldās previous contract was set to expire at the end of the season but the Reds have moved to secure him until the end of the 2012/13 season.
There was speculation surrounding the former Flamengo and Santa Cruz manās future at Hindmarsh Stadium but that has been settled by this latest announcement which has delighted the player himself.
āI feel very good and very happy with this deal. My decision wasnāt so hard because since I arrived here I have felt at home,ā Cassio said.
āThe supporters, the club, my teammates, the new owners and the Adelaide people made my decision easy with how they have treated me, so thatās why I chose to stay here.ā
Cassio, who joined the Reds in 2007, said he was currently feeling in the best shape of his career.
āIām 30 years old at the moment and to be honest I feel much better physically than when I was 20. Donāt ask me why, but I feel more confident, and after you get experience, you know where to run and you get smarter,ā he added.
āFootball is my life and I know I have to keep performing well, playing good and giving Adelaide my best. This season has been great for me and I hope the next two can be even better.ā