The Napoli boss was full of praise for his former star but suggested he picked the wrong team when he opted to make the move to Serie A
Napoli coach Carlo Ancelotti believes Cristiano Ronaldo's presence in Serie A can restore the league to its former glory, but joked that the star's only mistake was joining Juventus.
The 33-year-old has already scored five goals and set up four in nine appearances in the Italian top flight despite a slow start following his summer switch from Real Madrid.
The Portuguese star has been tipped to help Juve end their long search for a Champions League crown and enhance the Turin side's hold on the domestic title.