The Bianconeri recorded a resounding victory on Saturday night, but the Italian is concerned over the number of opportunities the opposition were afforded from range
Arturo Vidal scored twice and Mirko Vucinic and Carlos Tevez also got on the scoresheet in an emphatic win, but the Bianconeri coach urged his side to concentrate for the full 90 minutes, with the visitors enjoying numerous sights of goal from distance.
"Winning again and putting another four goals past Lazio is a sign of our growing form," the 44-year-old told reporters after the game.
"It’s a victory that gives us confidence, but we must never let our concentration slip. Lazio had several shots from distance and we do have to improve on defending those.
"Today we were facing a tough opponent who always made us suffer. We still need to improve, as in some stages there wasn’t enough pressure from our midfielders."
The reigning Serie A champions will face Inter at San Siro after the international break.