Juventus powerbroker John Elkann has no doubts Diego will live up to his price-tag.

The former Werder Bremen star has struggled for form after an explosive start to his Juve career.

But Elkann insists: "He was a great purchase. We made a substantial effort to create a squad of quality players and now must demonstrate they can live up to expectations.

"Diego would definitely be liked by my grandfather, even if this is a very tough championship and he is still to find the room to emerge fully."