It is still unclear whether Allegri is going to field a 4-3-3 with Emanuelson in the midfield or a 4-2-3-1 with Bojan in the trequartista role.
In the second case, the coach may prefer to have De Jong or Ambrosini instead of Nocerino to partner Montolivo and ensure some balance.
Pazzini is likely to start, while Pato will probably sit on the bench.
Napoli came from behind twice at Genoa, and with Juve and Inter dropping points in the last two rounds their title dreams were kept alive, though Fiorentina are not far behind them.
Milan failed their first important test against Fiorentina after a short period of good form, and Allegri still has to tweak his line-up to get the best from his players.
Here in Napoli, Milan may suffer from the opponents' dynamism, so the hosts should manage to control the game. Milan will try to counter and use the two flanks to provide crosses for Pazzini, but Cavani's recent form suggests that the most troubled of the two defences will be Milan's.
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