The Granata are without a Derby della Mole victory since 1995 and haven't scored in any of the last 15 editions.
"There were teams on the field with different qualities," Ventura told Sky Sport Italia.
"We were able to be aggressive against Juve last season, but this time round we have a different structure. We limited Juventus and they had very few opportunities, though we should've done better in possession.
"Juventus are the best side we've faced so far. It's difficult to be aggressive against their defence."
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