The defeat saw Napoli surrender their Serie A leadership to Inter Milan this week.
Stramaccioni told Radio Kiss Kiss: "Napoli's match in Como was surprising, (Antonio) Conte's team dominated in the first half. In the first 45 minutes the feeling was that the game was one-goal even if there weren't any great goal-scoring opportunities."
And he added: "In the second half everything was different: the move to remove (Romelu) Lukaku I think was dictated by the need to attack the space. At the end of the match Conte was discouraged and not angry. Napoli used to score a goal and it was difficult to do so, now instead they concede too much. In the matches in which Napoli played with 3-5-2 they were unable to control the game in terms of play and distances on the pitch.
"Will they return to 4-3-3? I don't know if they will do it against Inter. (Noah) Okafor has been here for a month, (Giacomo) Raspadori played as a winger under (Italy coach Luciano) Spalletti. I really don't know how Conte will behave, maybe he will mirror Inter and continue with 3-5-2."