French-born Bonny’s request to change his footballing nationality from France, for whom he played at under-21 level two years ago, was granted by world football's governing body FIFA on Friday.
The 22-year-old Bonny is of Ivorian heritage and expected to be included in their 26-man squad for the World Cup.
He helped Inter win the Serie A title this season, proving a super sub for the Italian club with five league goals.
Ivory Coast are in World Cup Group E with Ecuador, Germany and Curacao.
Bonny could make his debut before the tournament when the Ivorians meet France in Lens on June 4th in a friendly.