Born in Ugao-Miraballes, Biscay, Maguregui made his professional debuts in 1952 at the age of 18, with Basque Country giants Athletic Bilbao.
In 1963, after amassing official totals of and 235 matches and 42 goals, 29-year-old Maguregui left Athletic, retiring after spells with Sevilla FC (two years), RCD Español and Recreativo de Huelva.