(CNN) -- Inter Milan claimed their fourth successive Scudetto on Saturday night without kicking a ball, after AC Milan were beaten 2-1 by Udinese.
The Rossoneri began the day seven points behind the Serie A leaders and needed at least a draw to keep alive their slims hopes of taking the trophy from their city rivals.
But Udinese proved too strong at their Stadio Friuli and defeat means Carlo Ancelotti's men can no longer catch Inter at the top of the table.
Inter host Siena on Sunday evening, but knew they would be champions if Milan lost in Udine.
The Nerazzurri had one hand on the title when Gaetano D'Agostino fired Udinese in front from the penalty spot after 31 minutes.
Cristian Zapata then added another four minutes after the interval and although Milan battled hard to get back into the game, Massimo Ambrosini's last-minute goal came too late for the visitors.
The result means Inter maintain their seven-point advantage over Milan, who only have two matches remaining.
Inter's title triumph comes in the first year of Jose Mourinho's tenure with the club. The former Chelsea manager joined Inter last summer, replacing Roberto Mancini.
Speaking before the title was confirmed, Mourinho told Press Association Sport: "If it happens I will be proud because it's not easy to win something after only one year leading a team. "It has happened to me in both England and Italy and this is obviously a reason to be proud."
Meanwhile, veteran Inter Milan midfielder Luis Figo has announced that he will retire at the end of the season.
"I finish in the best possible way," Figo told Portuguese sports newspaper Abola. "I will no longer play at a high level." I
Figo, 36, won four Primera Liga title in spells with Barcelona and Real Madrid before joining Inter in the summer of 2005.
"This is a first for me," he added. "I've never won a title without playing. It's always difficult to win a league title in Italy. But with respect to the previous Serie A titles, this one feels different because it has been slightly more difficult."
In Saturday's other fixture, Christian Panucci's last-gasp strike earned Roma a 4-3 win over Catania in a thrilling encounter.
Catania midfielder Giacomo Tedesco cancelled out Simone Perotta's opener, but Roma then took control with further goals from Mirko Vucinic and Perrotta before the break.
The visitors again levelled matters in the second half with efforts from Giuseppe Mascara and Takayuki Morimoto, and a draw seemed to be on the cards until Panucci struck in the dying seconds.
The win sees Roma consolidate sixth place in the standings, three points ahead of Udinese, in the battle for the final Europa League spot.