 He also took part in Italy's footballing campaign at the 1988 Summer Olympics, where they managed a fourth-place finish after reaching the semi-finals yet again.He was also a substitute member of Italy's squad at the 1990 World Cup on home soil, where the team also managed to reach the semi-finals, only to suffer a penalty-shootout defeat to defending champions Argentina, following a 1–1 draw after extra-time; despite the loss, De Agostini was able to net his penalty in the shoot-out.Italy subsequently went on to capture the bronze medal following a 2–1 victory over England in the third-place match.