Houllier coached the French national team between 1992 and 1993, as well as leading club sides Paris Saint-Germain and Lyon to French league titles.
In his six-year stint at the helm of Liverpool, Houllier won the FA Cup, UEFA Cup and the League Cup twice.
He decided to step down as manager of English side Aston Villa in 2011 after he suffered a dissection of the descending aorta.
“Absolutely devastated by the news about Gerard Houllier, I was in touch with him only last month to arrange him coming to Liverpool. Loved that man to bits, he changed me as a person & as a player & got LFC back winning trophies. RIP Boss,’ tweeted the former Liverpool defender, who also played for England.
More to follow.