Mauro Camoranesi struck twice, with David Trezeguet, Diego and Felipe Mello all getting on the scoresheet.
"It was a tough game and some concern was understandable when Atalanta twice got back into it, but we kept our cool and I am very satisfied.
"It is a system that forces our opponents to go for the long ball and that means risking a one-on-one sometimes, but all our defenders are internationals so it's a risk worth taking.
"Those were the only two shots on goal from Atalanta, so we weren't really under pressure throughout. There was a distraction and the second goal was just stunning, so not much we could do about that."