Iheanacho scored the decisive goal in the fourth minute thanks to an assist from James Austin.
The Nigerian forward left-footed shot from inside the box beat goalkeeper Luke Daniels after he was teed up by the defender .
Iheanacho beat Dennis Praet and Christain Fuchs to the award.
He has now scored nine goals in his nine FA Cup starts (5 goals for Leicester & 4 for Manchester City).
The goal also increased the 23-year-old’s tally to seven and three assists in 12 appearances in all competitions for the Foxes this season.
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