At club level, Michelotti officiated the 1975 Coppa Italia Final between Fiorentina and Milan in Rome on 28 June; the former side won the match 3–2.

[1] He was also in charge of refereeing the second leg of the 1979 UEFA Cup Final between Borussia Mönchengladbach and Red Star Belgrade, on 23 May, which ended in a 1–0 home victory to the former club, which in turn saw the German side claim the title 2–1 on aggregate.

[2] The following season, he also officiated the 1980 Coppa Italia Final between Roma and Torino in Rome on 17 May, which ended in 3–2 penalty shoot-out victory to the former team following a 0–0 draw after extra-time.

[4] At international level, in 1976, Michelotti was appointed a referee for the 1976 Summer Olympics, where he officiated two matches.

Four years later, Michelotti was appointed a referee for UEFA Euro 1980, where he officiated a group stage match between Czechoslovakia and West Germany.