Isimat-Mirin was born in Meudon, in the southwestern suburbs of Paris, to Guadeloupean parents. When he was six years old, his family moved to Roissy-en-Brie. Isimat-Mirin began his career at France at Roissy-en-Brie. During his time there, he became friends with Paul Pogba, Florentin Pogba and Mathias Pogba. Isimat-Mirin then moved to Clairefontaine football academy and is a graduate of football academy.
