Ambrosetti was signed by Chelsea at the beginning of the 1999-00 season for £3.5m. Gianluca Vialli famously described the winger as the "Italian Ryan Giggs"; a description that heaped pressure on the newcomer. Ambrosetti made his debut against Aston Villa early in the season as a substitute, but despite occasionally impressing, including a confident strike in a memorable 5-0 away win against Galatasaray and a strong performance as a second half substitute against Coventry City at Stamford Bridge late in the season, he struggled to cope with the physicality of the English game. Ambrosetti was unable to hold down a regular place in the first team; many of the Italian's appearances came as a substitute, and when starting he would rarely finish a game. His last appearance for the Blues came as a substitute; replacing Gus Poyet against Derby County in the final league game of the season. The Italian wasn't involved at all in the 2000 FA Cup Final. Ambrosetti's career at Chelsea was as good as over when Vialli was sacked five games into the following season, with new manager Claudio Ranieri sending his compatriot out on loan to Piacenza a short time later. A loan spell back at Vicenza in 2001 preceded another at Piacenza, for whom he would eventually sign permanently in 2003. After Chelsea Ambrosetti made 28 league appearances for Piacenza following his move, before signing for Serie C1 side Lombardy side Pro Patria, which would be his final club before retiring from the game in 2005. Click here to view the record