The 21-year-old Nigeria international started the new year with a disappointing home defeat to city rivals, Feyenoord.
However, Okoye and Sparta Rotterdam bounced back immediately on Wednesday night after Lennart Thy netted the only of the encounter.
— Sparta Rotterdam (@SpartaRotterdam) January 14, 2021
Super Eagles shot-stopper made 4 crucial saves to help maintain the advantage.
The win means Sparta Rotterdam climb to eighth while Fortuna Sittard sit in 13th place in the Eredivisie table.