Zlatan Ibrahimovic scored the only goal of the game.
Gasperini lamented: "It's a shame about the result, as we were punished by their goal right after the restart.
"I remain satisfied with the performance. We may have struggled in the opening minutes, but we too had our chances.
"At the moment we are not earning as much as we deserve. It happened today and again with Fiorentina midweek.
"I am glad to note the team is improving, though."