We don't have many of those
Our defence is our biggest strength, to be honest. However, sometimes there is some sloppy marking when defending against cornerkicks and freekicks. Remember a couple of times this season when opposition players were allowed to head straight at goal, more or less unmarked.
Also, Bonucci isn't the best tackler in the game, despite having improved massively over the course of the last two seasons. He reads the game well, though, and is becoming increasingly good with clearances, headers and passing. But his tackle success ratio could be higher.
Barzagli and Chiellini are just beasts. I think that's well documented. Also, Lichtsteiner and Asamoah are very good defensively.