Gala won 1-0 in a game that was played out over two days due to snow and hail.
"It was difficult to play football in these circumstances and I said beforehand it was dangerous for the players, so perhaps better not to play," Mancini told Sky Sport Italia.
"Last night was practically impossible, as a sheet of ice had formed over the pitch and nobody wanted to continue. I told the UEFA delegate that in my view it wasn't right to play today either.
"At half-time it was already too late. Juve wanted to play before the game, or at least they didn't say anything. I agree with Conte, it was impossible to play football for either side. It became a lottery.
"After that it was an open game and we were more aggressive, so deserved the victory, perhaps because we knew that we had to win."
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