The Euro 2012 finalists recorded a hard-fought win over Japan to progress to the knockout stages, but the defender has admitted they had their fair share of luck
The Azzurri were trailing by two goals after a little over 30 minutes, but eventually recorded a 4-3 win courtesy of a late Sebastian Giovinco strike that saw them book their ticket for the next round.
"This is still the win that sees us qualify for the semi-finals, so that's mission accomplished,” Chiellini told Sky Sport Italia.
"We will have to learn from this game, though. Although we were a bit tired, we have to be more organised and act as a team.
"This was an important win because we suffered a lot. The most important thing is that we won, but we will have to analyse the match.
"The game against Brazil will decide whether we finish first or second in the group. We will now turn our focus to the Brazil game and then to the semi-finals."
Italy lock horns with Brazil on June 22.