Marco Zamboni, who made his Serie A debut with Juventus in 1997 but was released after playing just one match for the Turin giants, came back to haunt his former club, grabbing a first-half winner for the Calabrians.

Giuseppe Colucci gave Reggina an early lead, only for Zlatan Ibrahimovic to equalise shortly afterwards for the visitors.

Colucci was sent off 17 minutes from the end for a second yellow card before the game ended in further controversy in stoppage time when Juve's French midfielder Olivier Kapo found the net.

The goal was initially given by referee Gianluca Paparesta, but the linesman saw that Kapo had controlled the ball with his arm before his cool finish and kept his flag raised.

Paparesta consulted his assistant and awarded a free-kick to Reggina.

Defeat for Juve, the only black mark domestically and in the Champions League, means defending champions AC Milan can close to within two points of the pace-setters if they beat Roma on Sunday.

A large slice of luck enabled Reggina to strike the first blow in the 12th minute.

Colucci chased Giacomo Tedesco's chipped pass, but was beaten to the ball by Juve defender Fabio Cannavaro. Fortunately for the home side, the Italy captain's attempted clearance cannoned off Colucci and flew into the net.

Juve were equally fortunate 90 seconds later when a defensive error gifted them an equaliser.

Gaetano De Rosa was far too casual as he tried to play the ball out of defence and Ibrahimovic intercepted his pass and headed straight for goal.

The Swedish international kept a cool head and slotted the ball past Salvatore Soviero for his fifth league goal of the season.

Soviero smothered Marcelo Zalayeta's shot, before Reggina restored their lead in the 26th minute.

A free-kick from outside the penalty box was tapped to Zamboni and the 26-year-old defender's fierce drive deflected off the defensive wall, wrong-footing Gianluigi Buffon.

The Juve keeper got a hand to the ball but could not prevent Juve from conceding only their fourth goal of the campaign.

Earlier on Saturday Brescia secured a much-needed 1-0 win over Chievo.

Austrian midfielder Markus Schopp grabbed the all-important goal four minutes from time which propelled the Lombardy club up to 13th in the table.

Chievo, who went the first seven games unbeaten, fell one place to eight after losing their third game on the trot.

The match appeared to be heading for a draw when Schopp, who came off the bench in the 70th minute to replace Simone Del Nero, fired a powerful half-volley into the top corner after good work from Marius Stankevicius.