Inter turned the title race on its head with their 3-1 win.
"In all honesty, I expected them to man-mark Andrea Pirlo but wasn't sure if it'd be Fredy Guarin or Palacio. That's how they approached Fiorentina with Coutinho coming back, but this time they seemed to alternate," Chiellini said after the 3-1 defeat.
"Inter are very strong on the counter and until we kept our balance to lock down those spaces, we were in control and had the chances to add a second goal.
"As soon as we lost our unity and started to leave more spaces, Inter took advantage and deserved the victory."
Arturo Vidal had given Juve the lead after 18 seconds, but it should've been ruled offside.
"At half-time we were thinking of other things and not whether the goal was offside. In the second half Inter were able to stretch us out and that created the space they needed to score. The most dangerous moment is when we are open and lose possession.
"All their goals were created by these situations where we were open by going forward and caught on the counter when losing possession.