The France international dislocated his shoulder in the narrow win in Udine and was replaced for the start of the second half by Marcelo Zalayeta.

And it was the Uruguayan forward who scored the winner on the hour, powerfully heading home Mauro Camoranesi's corner.

Unbeaten Juve sit proudly at the top of the table on 13 points, two ahead of surprise package Messina, who were comprehensive 4-1 winners at home to Siena.

Andriy Shevchenko scored twice and set up the other goal for Kaka in AC Milan's controversial 3-1 win against Reggina which moved them up to third on 10 points.

Palermo, champions of Serie B last season, joined Chievo and Cagliari on nine points after winning 1-0 at home to Bologna.

Luigi Del Neri's first game in charge of Roma ended in a thrilling 3-3 draw at home to Inter Milan.

Roma were 3-1 down with 54 minutes gone, but showed their new boss they are prepared to scrap for points by fighting back to sneak a draw.

Francesco Totti reduced the deficit with his 100th Serie A goal before Daniele De Rossi prodded home from close range to restore equality 16 minutes from time.

Roma took an early lead thanks to Vincenzo Montella's crisp volley, only for Esteban Cambiasso to head Inter level before the break.

Inter then scored two goals in four minutes through Juan Sebastian Veron's deflected shot and Alvaro Recoba's flashing drive.

Del Neri was appointed as Rudi Voller's successor on Wednesday.

Despite an impressive recovery, Roma have plenty of ground to make up in the title race having taken just five points from 15. Inter are faring slightly better in ninth place.

Elsewhere, two goals in the last 11 minutes gave Sampdoria a 2-0 victory at home to Livorno, Roberto Muzzi's late goal earned Lazio a 1-1 draw at Atalanta and Parma against Fiorentina ended goalless.

The loss of Trezeguet clouded Juve's fourth win in five league games.

"The news on Trezeguet isn't good and we will decide what to do over the next week," said Juve coach Fabio Capello.

"His shoulder popped out and he must decide whether he wants an operation or not. With surgery, he could be out for four months."

Arturo Di Napoli scored twice for newly-promoted Sicilian side Messina, who are enjoying their first season back in the top flight after a 39-year absence and have already beaten AC Milan and Roma this season.

Defending champions AC Milan's result at the San Siro was not without a huge slice of fortune.

With Milan leading 2-1, Marco Borriello headed what looked like a perfectly good equaliser for Reggina only for the referee to rule out his effort for an infringement which only the official saw.

The Reggina players were still shaking their heads in disbelief when Shevchenko rammed home his fifth league goal of the season to secure another three precious point in their bid to retain the Scudetto.

On Saturday, Chievo extended their unbeaten start and rose to fourth thanks to a 2-1 home victory over Lecce, while Gianfranco Zola inspired Cagliari to the same scoreline at home to Lecce.

Zola got Cagliari off the mark in the 13th minute from the penalty spot, before providing the killer pass for Antonio Langella's winner seven minutes from time.