Muscular resentment for Giacomo Raspadori who left the Castel Volturno field today halfway through training for Napoli.
The blue player has been rested and will undergo instrumental tests in the next few days to investigate the situation further.
Raspadori will therefore miss Friday's away match in Sassuolo.
The former neroverde is the first point of reference for Spalletti's substitutions: so far he has played 23 games between Serie A and the Champions League, scoring five goals.