well not to sure but instead of buying players first give Hamsik a new contract because every1 goes after him and he'll be unhappy secondly a good players to buy for napoli wud be hulk,hernandez m;vila and hazard as they will all go to napoli and i cant comment on your tactics because i dont no the tactics u were using and if u want an attacking or defencise tactic i suggest 4-1-2-1-2 with hamsik in AM role set to support.