|Date of birth||8 August 1968|
|Place of birth||Chiasso, Switzerland|
|Height||1.89 m (6 ft 2 1⁄2 in)|
|Playing position||Centre forward|
|* Senior club appearances and goals counted for the domestic league only.
During his career, spent entirely in Switzerland and France, Grassi represented SC Zug, FC Chiasso, FC Zürich, Servette FC, Stade Rennais, AS Monaco, FC Sion, AS Cannes, Olympique Lyonnais and OGC Nice.
As an expatriate, his best years were with Rennes, scoring 15 and 11 times respectively, as the club had just returned to the first division in his first year, proceeding to qualify for the UEFA Intertoto Cup in the second.
Grassi retired in 2000, at nearly 32, with French second division's Nice. Six years later, he became president of his very first club, hometown Chiasso.