VINCENZO PINTO/AFP/Getty Images

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VINCENZO PINTO/AFP/Getty Images

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Ciro Immobile scored a hat trick as AC Milan's new-look side were humbled 4-1 by Lazio at the Stadio Olimpico in a game delayed for an hour by torrential rain.

A team featuring expensive summer signings including Leonardo Bonucci, Lucas Biglia and Ricardo Rodriguez just about held their own until Italy striker Immobile scored a 38th-minute penalty following Franck Kessie's foul on Luis Alberto.

Immobile's second, from a Senad Lulic cross only four minutes later, rocked Milan, who were hapless after the break as Marco Parolo set up Immobile to complete his treble before the latter played in Luis Alberto for the fourth.

Riccardo Montolivo pulled a goal back from distance before the hour, but not even the late dismissal of Parolo could help them save face.