Gonzalo Higuain hit a double in the victory.
"We're still at 75 per cent," Benitez told Sky Sport Italia.
"We have to remember this was a difficult game in which we had to show intensity, character and determination. It's also important to note the pitch was awful and the ball didn't bounce regularly.
"Clearly Higuain is a player who can make the difference for us. I spoke to him before the game, but I spoke to many of the players.
"The most important thing is not just that he scored, but that he put in a good performance, scared defenders and create space for teammates. It was difficult for us to play our style of football on this turf."
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