The Bianconeri began their European campaign with a disappointing draw against Copenhagen but the ex-Italy striker was pleased with Carlos Tevez's performances
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.
"He moved around a lot, he created some dangerous moments, but he – like the rest of the side – was just unfortunate."