Runaway leaders Napoli could secure the club's third title and first since 1990 this weekend if they beat Salernitana and second-placed Lazio drop points against Inter Milan at San Siro.
The Naples side were initially scheduled to play Salernitana on Saturday, with Lazio visiting Inter a day later which could have seen Napoli fans celebrating outside the stadium in Milan.
Napoli will now take on Salernitana at 15:00 CET on Sunday following the change, less than an hour after the score at the San Siro (12:30 CET kick-off) is known.
Napoli's following game at Udinese has also been pushed back from Tuesday to Thursday.
Napoli have 78 points from 31 games, with Lazio in second on 61 and seven games remaining.
Fans told not to take title party onto Vesuvius
Napoli fans preparing to celebrate the club's first Italian league title since 1990 have been told to steer clear of Mount Vesuvius, the volcano that overlooks the southern city of Naples.
Park authorities became concerned at reports that Napoli's fanatical fans planned to set off flares to light up Vesuvius in the Italian national colours should the team clinch the title on Sunday, branding the stunt dangerous.
"We are all pleased for Napoli's success which will bring honour to our region and great joy for people," said Vesuvius park commissioner Raffaele De Luca.
"But the celebrations must remain within the limits of civil behaviour," he added.
Vesuvius famously erupted in AD79 when it destroyed the nearby Roman city of Pompeii but it remains active.
