Benitez said: "At the end of the game we lost intensity and allowed John Arne Riise to cross. But before then we'd had around 15 shots on goal and many chances. The difference is made when it goes in the net.
"It isn't easy when you play so many games with such intensity. We had four or five counter-attacks where we could've scored and that's what made the difference."
Benitez was asked whether Diego Milito's poor form suggested Inter were overly-reliant on his goals.
"It's true that at the end there were a few tired players out there. Milito came off because he had a problem with his leg.
Incredibly, Inter could be overtaken at the top of the table tomorrow by Brescia and Chievo, but Benitez is not concerned.
"Nothing has changed for Inter. We just need to analyse why we didn't score and why we are sometimes weak in defence. That's what we have to work on."