Schuster, who played alongside Hughes at Barcelona, has criticised Robinho's £34million move to "a mediocre club".
But City's manager, who sends out Robinho against UEFA Cup first-round hosts AC Omonia in Nicosia tonight, expects Schuster to revise his opinion.
He said: "Maybe in the next few years we can change Bernd's view on Robinho's decision to join us."
City only sneaked through on penalties last time out in the tournament in Jutland, but Hughes said: "Getting into the group stage is key. European football is important for our development. If we get a sustained run to the latter stages, who knows?
"We're trying to go in the right direction and that's what Robinho has seen. He's come to a club he feels is going places."