Roma's 5-1 defeat to Cagliari on Saturday night was negative for the Giallorossi for all sorts of reasons, most notably the fact that they went down to ten men.
The sending-off of Nicolas Burdisso in the 22nd minute saw Roma go 2-1 down from Alessandro Matri's penalty, and the defender felt that this was his responsibility.
What's more, he regrets having possibly injured Daniele Conti, who is feared to have suffered a broken leg.
"I went in too hard, and I really regret it," he said of his red card incident.
"I am the first and only person responsible for this negative result. I said sorry to Ranieri and to Conti after the game. But I want to say that I went for the ball and not the knee. I never intended to hurt him."
Following Burdisso's expulsion Roma removed Francesco Totti and operated defensively, but still conceded four goals from set pieces overall.