The Old Lady has been linked with a summer move for the Bayern Munich star.
“I think we have enough quality in the middle of the park,” Marchisio told Tuttosport.
“However, I know that we need more champions if we are to improve as a team and bringing in great players can only increase the technical level.
“I think that Diego is a very good player, but if you ask me I would have no doubt who we should sign – I’d buy Ribery.
“Franck is an incredible player and he could provide us with even more creativity when Pavel Nedved retires.
“Cassano is also a champion and he has been reborn at Sampdoria after his troubled spell at Real Madrid.
“He has found the right environment and is showing the full extent of his talent. Would he help Juve’s cause? You decide…”
