Ismaël Tiémoko Diomandé was born on 28 August, 1992 in Abidjan, Ivory Coast. He is an Ivorian footballer who plays as a midfielder for Caen in Ligue 1. Ismaël first played as a youngster in Académie Mimosas. He moved to the suburbs of Paris in 2008 and spent a few years in the Paris FC academy.
In 2010, Diomandé joined Ligue 1 Saint-Étienne’s youth teams. At Saint-Étienne, he was in the starting lineup of the 2011 U19 Gambardella Cup final against Monaco. In the same year, he broke into the first team before signing a professional contract in 2012.
Ismaël was loaned out to Stade Malherbe Caen in the winter transfer window of January 2016. In June 2016, he joined the club permanently, signing a three-year contract.
He had his honors and awards during French League Cup: 2012–13, Ivory Coast World Cup: 2014 and Africa Cup of Nations: 2015.