Elkann has discussed signing Diego with sports director Alessio Secco and is prepared to throw £20 million at Werder to make the deal happen, says Controcampo.
Ranieri is ready to shake-up his playing system to complement Diego, while Juve's board are prepared to offer a five-year deal worth £2 million-a-season.
With Real Madrid having gone cold on Diego's trail, intermediaries have told Juve they have a free run at the midfield schemer.