Both stars arrived in the final days of the summer market.
"The new arrivals brought enthusiasm to the team and everyone around this club," said Zanbrotta.
"Nobody expected a transfer market like this. We held our breath right to the final minute and thankfully brought in two champions like Ibra and Dinho.
"I already know Zlatan pretty well from our time at Juventus and I think he can give us that step up in quality. His physique also brings more options and weight to the front line, which we were lacking.
"Robinho is the icing on the cake. We really could not have asked for more."