Situation #1:
You can see here our defence line letting the man alone in a very dangerous zone ... Bonucci, Chiellini and Martinez (allthough Martinez had to stay close to Nainggolan) are simply just looking how the opposition player jumps in front of them while Sorensen and Barzagli are already unable to do anything 'cause of the ball height.
Situation #2:
At this attack our defence isn't positioned how it should be. The ball first comes to Cossu on the left and he's totaly alone 'cause Sorensen is covering one of the two players inside the box. Barzagli also covers one while Bonucci and Melo both standing in empty space with no one to cover. Krasić is to much inside the field.
Cossu here recieves the ball and after smooth drible chips it on the second post. Krasić hasn't closed him as he should have. Aquafresca is on the other side ahead of Martinez and behind Giorgio who goes forward to prevent a player in front of him to threaten Gigi. There he makes a mistake but he had to do it 'cause Melo didn't cover any of Cagliari players.
Here you can clearly see that Martinez stays not folowing Aquafresca while Giorgio is late to make offside trap. After that Aquafresca scores.
Sitution #3:
Free kick now. Cagliari player easily chips the ball over the wall and Conti is alone there. Our CB's didn't closed him and are giving him a lot of space to react. Martinez stays on his side.
Conti now shoots but badly and it goes over the bar but it is obvoius that our defence have reacted very bad again. Only Martinez tried to get the ball but he was to far from the start so he couldn't cach up.
Situation #4:
Disallowed goal. Canini did pull Toni but our defence line isn't positioned as it should be, again. I think that Nene stayed alone this time. Aquilani doesn't cover anybody, Giorgio is in front of two Cagliari players and Melo is with Aquafresca and Conti.
Barzagli takes one while Sissoko is late to prevent Nene's header. Luckily Canini drags Toni down and referee whistles for a foul. In most cases referees don't make this decisions.
Toni is on the ground, Nene scores and Sissoko haven't got a single clue what's happening ... he made a mistake by letting Nene alone and going to Barzas player to double him up. Bonucci is just a little bit too short and he couldn't get the ball.
I think that this is out biggest flaw throughout entire season - defence line, positioning and reacting on free kicks, korner kicks and crosses as well. What they do on trainings is clearly a pure crap. They are letting opposition players to walk and move as they wish. It is embarassing at the moments but fortunately last night we were not punished for our mistakes.