Carlo Ancelotti commended Napoli's efforts in the transfer market after capturing Hirving Lozano a day before the new Serie A season.
Napoli reportedly spent €40million to sign the Mexico international from PSV.
Lozano, 24, joins centre-back Kostas Manolas, right-back Giovanni Di Lorenzo and teenage midfielder Elif Elmas among the new faces at Stadio San Paolo.
Ancelotti guided Napoli to second last term, 11 points behind champions Juventus, and thinks his squad is better resourced this season.
"We have become more competitive," Ancelotti said.
"With Lozano and the other new arrivals, the level of quality in the squad has increased and we're stronger overall than last year.