The Italian champions began their campaign with a 1-1 draw against Copenhagen in Denmark, despite having a number of chances.
And Vialli believes that a good win would have been an ideal way to kick off their campaign in Europe's top competition.
It's a shame about the result, he told Sky Sport Italia.
A convincing opening game victory would have been an ideal start to a Champions League campaign.
Vialli went on to praise the performance of Carlos Tevez in Copenhagen due to his movement and creative influence.
I really liked Tevez, he continued. His performance was positive even if he didn't manage to score.
