On 2 October Delgado made his official debut for the Ches main squad, playing the full 90 minutes in a 2–0 home win against Lille OSC for the season's UEFA Champions League.
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The 1945 Coupe de France Final was a football match held at Stade Olympique Yves-du-Manoir, Colombes on May 6, 1945, that saw RC Paris defeat Lille OSC 3–0 thanks to goals by André Philippot, Pierre Ponsetti and Oscar Heisserer.
The 1947 Coupe de France Final was a football match held at Stade Olympique Yves-du-Manoir, Colombes on May 11, 1947, that saw Lille OSC defeat RC Strasbourg 2–0 thanks to goals by Roger Vandooren and an own goals of Joseph Lang.
The 1948 Coupe de France Final was a football match held at Stade Olympique Yves-du-Manoir, Colombes on May 10, 1948, that saw Lille OSC defeat RC Lens 3–2 thanks to goals by Roger Vandooren and Jean Baratte (2).
The 1949 Coupe de France Final was a football match held at Stade Olympique Yves-du-Manoir, Colombes on May 8, 1949, that saw RC Paris defeat Lille OSC 5–2 thanks to goals by Roger Gabet (2), Roger Quenolle and Ernest Vaast.
The 1953 Coupe de France Final was a football match held at Stade Olympique Yves-du-Manoir, Colombes on May 31, 1953, that saw Lille OSC defeat FC Nancy 2–1 thanks to goals by Jean Vincent and Bernard Lefèvre.
The 1955 Coupe de France Final was a football match held at Stade Olympique Yves-du-Manoir, Colombes on May 29, 1955, that saw Lille OSC defeat FC Girondins de Bordeaux 5–2 thanks to goals by Jean Vincent, Yvon Douis (2) and Gérard Bourbotte (2).
Among the teams which were believed to have shown interested in signing him at the time were Catania, Genoa, Lazio and Torino of Serie A, Celtic and Rangers of the Scottish Premier League, Werder Bremen and Wolfsburg of the Bundesliga, and Lille of Ligue 1.
Born in the Lille region, Bailleul began playing football with the Lille OSC youth academy.
The delays forced Lille OSC to play their league matches at Stadium Nord Lille Métropole and their 2005–06 UEFA Champions League games at Stade de France in the Paris suburb of Saint-Denis.
Although the club wanted the new stadium to retain the old name Stade Henri Jooris (named after Henri Jooris, former Lille OSC manager), the mayor proposed it to be called Stade Félix Grimonprez after Félix Grimonprez, a former field hockey player who competed in the 1928 Summer Olympics and the 1936 Summer Olympics.