Tomas Hassler comes to mind. Such a great midfielder, with remarkable career at international and club level (101 appearances for Germany), but a flop at Juve. He played only 1 season and scored only 1 goal.
He was great before and after the year in Juventus.
@Badass Devil , i wouldn't put Ian Rush on the list. We expected a lot from him and he didnt play like he did in Liverpool but we had a lousy team back then. Ian Rush was our league and overall top scorer nevertheless.
He was in Juve for 1 year only but like i said he was our topscorer in serie A (with 7 goals

) and overall topscorer with 13 goals

.
If our topscorer scored only 13 goals and if our second best scorer was a defender, Luigi De Agostini, imagine how bad the midfielders and the other attackers were. We were 7 place in seria A that season.