 With Italy, Marini obtained 20 caps between 1980 and 1983, and he represented Italy in their victorious 1982 FIFA World Cup campaign, which enabled him to become a World Champion.Marini was known in particular for his strength, work-rate, and ability to break down plays as a defensive midfielder, as well as his powerful and accurate striking ability from distance.As coach, Marini also managed Internazionale during the 1993–94, where he won the UEFA Cup in 1994, despite narrowly avoiding relegation in the league; he later also coached Como on two different occasions (1997; 1999–2000), as well as Cremonese (1997–99), and the Italy B side in 2001.