The Nerazzurri have added Ezequiel Schelotto, Mateo Kovacic and Zdravko Kuzmanovic to their ranks, while Philippe Coutinho exited the San Siro bound for Liverpool.
Moratti, 67, said that he was particularly pleased with the capture of teenage starlet Kovacic from Dinamo Zagreb.
"I am very pleased with what we have done in the market," Moratti told Sky Sport Italia.
"Kovacic is something special. He is definitely a good buy – I am curious to see what he does for us on the pitch."
Inter are currently fourth in Serie A.