Lato had arguably had been Poland's best player at the 1974 World Cup. However, by the time of the 1978 tournament in Argentina he was unable to replicate his great form. In the first round, Poland were seeded in Group 2 with West Germany, Mexico and Tunisia. Poland did well, winning the group by drawing 0–0 with West Germany, and winning against Tunisia and Mexico, 1–0 and 3–1 respectively. Lato, however, was only able to score one goal, albeit a decisive one against Tunisia.