For many, the Wales midfielder produced his best performance in a Juve shirt on Sunday.
And Di Cano told Sky Italia: "Ramsey seemed like the one of Arsenal.
"Often he is undisciplined, but what (Maurizio) Sarri needed was this here. When he was good he broke the balance in one on one.
"Juventus was more sterile (last season), today I saw ideas. We need to wait for him to challenge teams. The doubt is about the intricacies in between but Ramsey will be decisive for (coach Andrea) Pirlo's game."