“We've all grown," Koulibaly said on Radio Kiss Kiss Napoli.
“We're only at the start season but we've had hard games and we've won them all. So we need to keep doing this, we want to win every game even though obviously it's difficult.
“We're all thinking about doing even better.
“Juventus? They'll go their way and we'll go ours. We'll do everything to win [against SPAL] on Saturday and continue our path.
“We're only at the start, the league is still long and there are a lot of strong teams. They're all good, from Milan to Lazio and even Fiorentina, so we can only think about ourselves. We're confident."