Federico Santander scored the only goal of the game.
“A few things irritated me, but for the rest we'll wait until the usual post-match analysis tomorrow morning," Spalletti told Sky Sport Italia.
“We looked intimidated and create problems for ourselves, even when there is no need. When there is insecurity, you make a mistake and the other team scores straight away.
“If you don't have a strong character to match the history of the club and the stadium, you can't react. Perhaps in that sense we have struggled the most. I thought that we had built the foundations at least, but instead we make really basic mistakes."