The pair played together at Arsenal, with Ramsey now joining Juve in a Bosman deal.
“He came here for treatment, but here we have the best physiotherapists in the world," the goalkeeper told Gazzetta dello Sport.
“I took him out for dinner one evening, he'll be a great player for us. He's a midfielder with a lot of quality, he's very good positionally, he scores lots of goals and provides lots of assists.
“When he's fit, he's one of the best and he'll give us a big hand in achieving our objectives.
“Whether he plays as a midfielder or No 10 depends on the new Coach. For me he can also play at right-back, since he defends very well."