[2] While with Fiorentina, Marchesi appeared for Italy twice, making his international debut in a 4–1 victory over Argentina on 15 June 1961.

[3] Following his retirement in 1973, Marchesi pursued a career as a manager, coaching several clubs, including Montevarchi, Mantova, and Ternana, before guiding Avellino to avoid relegation to Serie B during the 1978–79 Serie A season, as well as the following season, which earned him attention from larger clubs in Italy.

During his managerial career, Marchesi achieved impressive results in his first spell with Napoli during the 1980s, competing for the league title (finishing third in 1980–81 and fourth in 1981–82).

He also had the opportunity to coach both Diego Maradona during his second spell at the Neapolitan club, and Michel Platini with Juventus during the playmaker's final season with the Turin side, two of the greatest attacking midfielders of all time.

After brief stints at Venezia and SPAL between 1992 and 1993, Marchesi's last managerial job was at Lecce; however, his team was relegated from Serie A in 1994, after which he retired from coaching.