The Argentine defender, who says his focus is on Inter, refused to suggest that the Scudetto is a possibility for the Nerazzurri this season
The Partenopei have brought on board the likes of Gonzalo Higuain, Jose Callejon and Pepe Reina as Rafa Benitez looks to go one better than Walter Mazzarri did last season by winning the Scudetto, while Inter have struggled to attract top talent.
However, the Argentine defender, 33, told Sportmediaset: "I definitely don't regret anything. I’m pleased with the choice I made.
"Napoli are putting together a good team, they’ve signed some good players and I’m happy for them, but my thoughts are only on Inter.
"It’s too early to say who will win the Scudetto and it’s still early days to say what Inter’s targets for the season can be.
"The first month at Inter has been good for me. We’re working very hard and that’s what matters in pre-season. Now we’re about to start playing competitive matches so we really have to pull out all the stops.
"We still need a bit of time because this is a new group of players and it takes a while to put the coach’s ideas into practice. But even in the games we lost - apart from the [4-0 loss to] Valencia - we did good things.
"We do need to improve at the back. You always pay for even the slightest mistake in defence. We have to get up to scratch quickly now."
The Nerazzurri finished ninth in Serie A last season - nearer to the relegation zone in points than the top two - and will be hoping to begin making amends under new boss Mazzarri in their opening game against Genoa on August 25.