He spent 12 La Liga seasons with Real Madrid, appearing in 366 competitive matches (75 goals scored) and winning 11 major titles, including the 1966 European Cup.

He returned after a short loan at neighbouring Atlético Madrid where he was instrumental in avoiding relegation from La Liga in the 1963–64 season, going on to remain 12 years at the Santiago Bernabéu Stadium.

[2][1] Even though his teammates included the likes of Amancio Amaro, Francisco Gento or Ferenc Puskás, Grosso was team top scorer in his first two seasons, scoring 17 goals from 28 appearances in 1964–65 and 11 in 29 in the following.

For his "team-first" approach he was eventually dubbed Obrero (worker),[2] and he left his main club in June 1976 at the age of 32, retiring from football subsequently.

His debut occurred on 1 February 1967 in a 0–0 draw against Turkey at the Ali Sami Yen Stadium for the UEFA Euro 1968 qualifiers,[7] and he scored in the second contest between the two teams, a 2–0 victory in Bilbao.