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Undoubtedly, Napoli was very lucky in the last season , so they were able to secure the Serie a title. The team was only 1 point ahead of Inter milan. If Inter Milan had not given their full focus to the Champions league, then perhaps it would not have been easy for napoli to win the Serie A title.
As well , Napoli's attack was very weak in the last season. The team scored only 59 goals in 38 matches. Inter Milan's players were able to score 79 goals. However, since Napoli's overall condition was stable, they were able to achieve good results despite a weak attack.
In this season , Napoli should have added an experienced striker to the squad. Since the team will fight for the Serie A title and will also perform in the Champions League. But Napoli did not add any experienced forward to the squad. The team is going to start the season with a weak attack.
I really don't know what Antonio Conte plans to do to his squad as regards adding a back up striker but if he fails to do the needful then they are going to have too many problems in trying to defend their title, and perhaps they might not be too lucky to have their only striker always fit due to injury problems and fatigue because he is going to have to play too many games in different competitions. If Inter Milan could set their priorities right this season then they can perhaps topple on Napoli and win the league.