The Tuscans had by far the better chances in tonight's 0-0 draw at the Stadio Franchi, including a crossbar hit by Stevan Jovetic.
"It isn't always necessary to crush your opponents, as at times you also have to be good at containing them," argued stand-in Coach Carrera.
"Fiorentina deserve a lot of credit, as they ran hard for 90 minutes and played very well. We were unable to do what we wanted to.
"We knew Fiorentina would put in the performance of a lifetime, so it was a show of strength for us to keep them quiet and maintain the clean sheet.
"We had to block David Pizarro, although we didn't manage it that often."