A product of Chievo's youth system, Ekuban spent last season on loan in Albania with FK Partizani, for whom he played in the the Champions League and Europa League preliminary rounds.
Ekuban follows Samu Saiz, who Leeds announced yesterday was joining from Huesca.
Leeds' official website states Ekuban could feature in the club's friendly on Wednesday night against North Ferriby United, and will travel on their pre-season tour of Austria.
The upcoming tour has led to an increased push from Leeds to get deals over the line this week and he may not be the final addition.