The Foxes looked on course for a first Premier League win since August as birthday boy Iheanacho and Jamie Vardy capitalised on defensive errors to have them two goals up at the interval.
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The Foxes are currently ninth in the table with six points to show from their four matches, while Brighton occupy sixth, having picked up nine points from their first four fixtures of the 2021-22 campaign.
The Foxes midfielder is currently on holiday having been given extra time off this summer due to his international commitments.
The Foxes won 2-0 at Brighton on Saturday but the victory came at a cost as Ndidi was dismissed for a second bookable offence three minutes from time.
Since leaving Manchester City for the Foxes, Iheanacho has endured a frustrating period with six goals coming from just eight starts and 13 substitute appearances in all competitions.