After a poor first season in La Liga – 12 games, no goals – he became a very important first-team unit, helping them to the 1956 national championship and three Copa del Rey trophies in four years.
[1] 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.
[3] Maguregui then managed to lead two more teams to division one promotions, RC Celta de Vigo in 1978[4] and lowly AD Almería in 1979,[5] overachieving with the latter in the following season (ninth-place finish),[6] which prompted his signing with a club he had represented as a player, Español.
[9] Maguregui was fired by Atlético in early October 1988 in spite of two consecutive home wins, 3–0 against Cádiz CF for the league and 2–1 over FC Groningen in the UEFA Cup (away goals rule elimination), being one of four coaches used by the club during the season (elusive Jesús Gil was the chairman) which saw the team finish in fourth place.
[12] Maguregui's last job at the professional level was with Celta, with the coach arriving in Galicia late into 1989–90 – which ended in top flight relegation – and leaving 18 games into the following season.