Barella had been missing since November due to injury.
The midfielder remarked afterwards: “Napoli are a strong side and it's an intimidating environment here, it's never easy. But we're a great team, we were focused only on our objective.
“I'm doing well, I've worked hard to rejoin the team. This period long and difficult because I skipped matches that I would've liked to play. However, I'm pleased because I know that whoever plays will do really well. This win demonstrates that we're a strong side, we have one of the best coaches in the world and we are Inter - we want to compete right until the very end."