He notably managed Belgian Pro League club Lierse during the 2014–15 season and was a co-founder of the JMG Academy.
[1] During his life, he lived in numerous countries including Algeria, Ivory Coast and Madagascar.
[1] Together with his uncle, he founded the JMG Academy in partnership with Algerian club Paradou AC, where he was also manager during the 2011–12 season.
[3] He left Algeria in 2012 to take up the manager's post at French Championnat National side Paris.
[4] In January 2015, Guillou was appointed manager of Belgian Pro League side Lierse following the departure of Slaviša Stojanović.