The Old Lady missed out on a domestic double last season, as the Partenopei proved to be too strong in the Coppa Italia final, and the Turin giants will be gunning for revenge on Saturday, according to the youngster.
"The season's only just starting but we feel good, our legs are starting to tick over nicely and in a week's time we'll be in top shape. We're fired up for this game with Napoli," Marrone was quoted as saying on the club's official website.
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Marrone featured in defence earlier this pre-season, and the 22-year-old - a midfielder by trade - has made it clear that he is happy to help out wherever he is needed.
"The boss told me a few days ago that he wanted to try me out in defence," he added.
"We already discussed it last year before the game in Genoa, but then Vidal came in and did a great job. I'm ready to do my bit for the team wherever the coach wants me to play."