Sulejmanović was born in Srebrenica, Bosnia and Herzegovina, but migrated with his family to Jyväskylä, Finland in 1997. The family finally settled in Kaarina in 2000, where Sulejmanović grew up playing junior basketball for the Kaarina Ura team.[1] In 2011 he transferred to the junior academy of KK Union Olimpija, signing a four-year contract as he made the full squad one year later.[2] He participated in the EuroLeague for the first time against Real Madrid Baloncesto in December 2012.[3]
In July 2013, Sulejmanović moved to FC Barcelona Bàsquet.[4] During the next two years he mostly played with the FC Barcelona B reserve squad.[5] In April 2015, he was loaned to Italian team Orlandina Basket for the rest of the season.[6]
On August 4, 2016, Sulejmanović signed with Croatian club Cibona.[7]
Sulejmanović has played for the Finnish U-16[16] and U-20 junior national teams in the past. He has however announced that he will represent Bosnia and Herzegovina national basketball team in future senior international tournaments.[17]