 Born in Rome, Lamberto grew up in Grosseto, playing in the youth squad of U.S. Grosseto, the same club of his father Lorenzo.His professional career began in the youth squad of Modena, during the 1989–90 season down in Serie C1.He moved into the Serie C2 division with Centese he notched up over 20 games with the club during the only season he was with them.