The Nerazzurri will host the Viola at San Siro in their sixth Serie A game of the season, and Stramaccioni does not underestimate the threat posed by Vincenzo Montella's side.
"Fiorentina are in great form," he said. "They are playing some excellent football and with just a bit more luck they might have found themselves in an even higher league position than where they are now.
"We will have to be at our best to beat this Fiorentina side."
Inter are currently fourth in the Serie A table with nine points from five matches, four points behind leaders Juventus and Napoli.