Champions League matches are always different different tempo, different desire. Napoli has an excellent team and relatively not-so-difficult opponents, but still, this is the UCL and every opponent knows how to play great football. If Lukaku recovers, that would contribute a lot to the team since they are currently without a classic striker. However, the midfield with KDB is more than excellent.
UEFA Champions League always have surprises with we never know which team is having good performance and which is going to let down punters which are backing them with their funds Napoli is having good squad which have good start of their title defend.
Antonio Conte is also well aware about challenges which are he going to face in coming matches I am expecting they will be in top ranks because they are having enough quality to stay in good against any opponent Manchester City is currently not good which will be beneficial for the at Etihad Stadium both can go with their best for having early advantage, but I am expecting Napoli can pass this challenge.