Juve lost 1-0 as Arthur's error was decisive, his back-pass was easily intercepted by Adolfo Gaich for the goal.
Pirlo said, “There was no pressure, just the expectation to do better than this. Instead, it was a bad day in every respect, with our attitude, technical errors, everything. When you play like this, you can well lose.
“We were eager to win the game, but also knew it would be a difficult match, as Benevento are well-organised with two tight lines, so we had to be calm and spread them out.
“Instead, we were frenetic, made lots of mistakes and unfortunately were unable to get the result we wanted."
On catching Inter Milan and their ten point lead, Pirlo added: “We must continue believing, continue our path so that we are up there. As I said yesterday, the objective does not change, but we do need a completely different attitude to this. We wear an important jersey and must honour it every time."