He is also the former president and chairman of French professional football club Lille OSC.

In 1975-1976, Seydoux worked with director Alejandro Jodorowsky on a film adaptation of Frank Herbert's Dune.

The movie was never made due to lack of financing; the story of the project is told in Jodorowsky's Dune, which prominently features Seydoux.

[2] Seydoux is the grandson of scientist Marcel Schlumberger and has two brothers; Jérôme and Nicolas.

[3] Jérôme is a shareholder on football club Olympique Lyonnais.