Napoli are in serious trouble. Back-to-back defeats, a squad ravaged by injuries, and dressing room tensions that have now spilled into the open paint a troubling picture of a club losing its grip on the season. The 4-1 loss to Porto in the Champions League, following the 2-0 defeat at Juventus in Serie A, leaves Allegri's side with just three points from four European games and sitting eighth in the league table with 14 points from ten matches, already 14 points off the top.

The rot goes deeper than results. During the Porto defeat, a public argument broke out between Kevin De Bruyne and Lorenzo Lucca, while Matteo Politano also drew attention for the wrong reasons. These flashpoints reflect a squad under strain, and the fallout has been swift. President Aurelio De Laurentiis travelled to the Castel Volturno training ground on Friday as the squad entered a retreat ahead of Sunday's home match against league leaders Lazio.

The injury situation compounds the pressure. De Bruyne had only just returned from the ankle problem that forced him off at half-time against Juventus, while Allegri faced the Porto game without recognised fullbacks on either side. The squad's depth is being tested at the worst possible time. With Lazio arriving at the Maradona on Sunday, Napoli need a response fast, or questions about Allegri's position will only grow louder.