Fiore is a youth exponent from Standard Liège. On 11 December 2014, he made his senior debut against Feyenoord Rotterdam in the UEFA Europa League. Standard manager Ivan Vukomanović gave him a place in his starting line-up.[4]
On 9 January 2018 he signed with Palermo.[2] After making only three appearances with the Rosanero (two at Serie B level during the final part of the 2017–18 season, plus one in a 2018–19 Coppa Italia game against Vicenza[5]), he was loaned out to Serie C club Imolese for the remainder of the 2018–19 season.[6]
After Palermo's exclusion from Serie B, he was signed as a free agent by Cercle Brugge.[7]
On 16 January 2020 he returned to Italy, signing with Teramo.[8]