Iheanacho has now scored in back-to-back league games and has taken his tally for the season to three in 10 appearances.
Kiernan Dewsbury-Hall put Leicester 1-0 up in the 60th minute before Iheanacho made it 2-0 on 76 minutes after a superb assist from Ndidi.
In the 90th minute Dewsbury-Hall grabbed his second goal to put Leicester 3-0 ahead.
The win took Leicester, on 27 points, two points clear of second-placed Ipswich in the league table.
The Foxes have won four (lost one) of their last five games in all competitions.
Both Ndidi and Iheanacho were called up for the Super Eagles double header friendly game against Saudi Arabia and Mozambique this month in Portugal.
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