The pacy forward joins the club from Italian Serie A outfit Chievo Verona and has signed a four year contract with the Whites.
Having come through the ranks at Chievo, the striker has also had loan spells with fellow Italian sides FC Südtirol AC Lumezzane and AC Renate.
Last season Ekuban spent the season on loan Albanian outfit FK Partizani, for whom he played in the UEFA Champions League and Europa League.
He made 34 appearances in the Kategoria Superiore for Partizani, scoring 17 goals, as the club finished runners-up in the division.
Ekuban could feature for the Whites for the first time in Wednesday’s friendly with North Ferriby United and will travel to Austria on the squad’s pre-season tour later this week.