El 25 de març de 2017, Gnagnon va debutar amb la selecció francesa sub-20. HisFou firstel everseu gameprimer forpartit aamb [[Franceseleccions nationalfranceses youthper football team|French youth team]]edats.<ref>{{cite web|url=https://www.fff.fr/equipes-de-france/4/u20/matchs/2435/2017-03-25/france-angleterre|title=Match - France - Angleterre - FFF|publisher=FFF.fr|accessdate=2017-05-23}}</ref>
HePosteriorment laterva chosetriar tode representrepresentar [[Ivory{{Sel|Costa Coastd'Ivori}}, nationalmercès footballal team|Ivoryfet Coast]]que forla whomseva hefamília isés eligible through his familyd'sorigen [[IvoryCosta Coastd'Ivori|Ivorianivorià]] origins.<ref>{{Cite news|url=http://www.espnfc.com/ivory-coast/story/3121900/joris-gnagnon-latest-to-join-ivory-coast-recruitment-drive|title=Joris Gnagnon latest to join Ivory Coast recruitment drive|date=2017-05-08|access-date=2017-05-23}}</ref><ref>{{Cite news|url=http://koaci.com/cote-divoire-franco-ivoirien-rennes-joris-gnagnon-refuse-offre-milliards-seville-105440.html|title=Côte d'Ivoire: Le Franco-ivoirien de Rennes Joris Gnagnon refuse une offre de 6,5 milliards du FC Seville|last=Kautcha|first=Donatien|date=2017-01-10|language=French|access-date=2017-03-25}}</ref> HeFou wasconvocat calledamb upCosta tod'Ivori theper [[Ivoryprimer Coastcop nationalel football19 team|Ivoryde Coastmaig national team]] for the first time on 19 Mayde 2017.<ref>{{cite web|url=https://www.lequipe.fr/Football/Actualites/Cote-d-ivoire-marc-wilmots-convoque-cornet-et-gnagnon/802514|title=Côte d'Ivoire : Marc Wilmots convoque Cornet et Gnagnon|publisher=L'Équipe.fr|language=French|accessdate=2017-05-23}}</ref>
However,De hetota nevermanera, madeno anhi appearanceva forarribar thea Africandebutar, nationi andel statedmaig in Mayde 2018 that he had not ruled out playing for the European country at senior levelva despiteafirmar switchingque allegianceno tohavia Ivoryrenunciat Coasta thejugar previousamb yearFrança.<ref>{{Cite news |url= https://www.bbc.co.uk/sport/football/44095940 |title= Ivorian Joris Gnagnon hints at France switch |date= 2018-05-12 |access-date= 2018-05-25|publisher=BBC.com}}</ref> HeLlavors wasfou subsequentlyconvocat calledamb upla byselecció the [[France national under-21 football team|Francefrancesa undersub-21 team]]per teamuns foramistosos friendliescontra againstSuïssa Switzerlandi andItàlia Italyel inmaig Mayde 2018.<ref>{{Cite news|url=https://www.lequipe.fr/Football/Actualites/Espoirs-joris-gnagnon-et-sofiane-alakouch-en-renfort/903013|title=Espoirs : Joris Gnagnon et Sofiane Alakouch en renfort|date=2018-05-25|access-date=2018-05-25|publisher=L'Équipe.fr|language=French}}</ref>
