The Brazil star joined the Liga champions for £48 million last month and Schuster - who took the reins at La Rosaleda after Manuel Pellegrini joined Manchester City - believes the Catalans have invested in "another nuisance" who will make life tough for La Liga's defenders.
"The Confederations Cup is where we really saw him and he began to reach those expectations," Schuster told AS. "Aside from [Lionel] Messi, he is a player who is going to give a lot to Barcelona.
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Schuster revealed he came close to accepting offers from the Middle East, China and Russia before Malaga approached him to replace Pellegrini, and he is delighted to have returned to Spain.
"Until Malaga came along I saw myself outside of Spain," he explained. "In Turkey, Qatar, Dubai, Russia or China, they were very interested. Luckily, Malaga got in contact and that made me very happy.
"Spain has something special. That is where the national team is, the big teams... in general, La Liga is more competitive and more healthy than elsewhere."
Malaga have had to contend with the loss of key players this summer, with Isco, Martin Demichelis, Joaquin and Jeremy Toulalan all having moved to new clubs, but Schuster remains confident his side can take inspiration from Atletico Madrid last season and sustain a challenge for the top four.
"I would have liked them to stay. It is difficult to fill their gaps. Isco has done something special and unusual. I have no doubt we will find the way," he continued.
"We'll continue with the 'league of two'. Last season Atletico had a big season and now Villa has signed, but they've lost a man of 30 or 40 goals, Falcao.
"Malaga will see how we fit in from the beginning. The only good thing about a 'league of two' is that third and fourth are very equal."
Finally, Schuster revealed his admiration for new Bayern Munich boss Pep Guardiola, admitting the news of his appointment came as a shock in Germany last season.
"It was a bombshell in Germany. At one point Uli Hoeness said the next coach had to speak German. And then Pep speaks German!," the 53-year-old added.
"It's something very special and Germany are delighted. They must feel very proud because this will raise the quality of the Bundesliga. And Thiago [Alcantara] is a star player."