With players like De bruyne coming to Napoli they are in a good position to defending their league title because he is one player that has shown quality while in Manchester City he has gathered enough experience yes it's true that injury has reduced his level of efficiency he is still one of the best players in the world I see de bruyne coming back to form in Napoli because he will be playing along side top quality players
De Bruyne can still have a big impact for Napoli, Conte job will be much easier with De Bruyne in his squad. Serie A is not as competitive as the Premier League, so De Bruyne seems to be able to adapt easily and quickly. Napoli efforts to defend the Scudetto next season will actually be a little easier, because Inter Milan don't seem as strong as last season after changing managers.
With the recruitment of De Bruyne, Napoli might be able to go further in the Champions League, because now they have a pretty good squad depth. De Bruyne experience with Manchester City is unquestionable, that's why many people say Napoli are lucky to have him. For the next two or three seasons, De Bruyne might be able to maintain his performance at the top level.