Albion look to bring an end to run of two defeats, while Leicester have drawn and lost in their last two matches.
Third place Foxes know three points will move them up to second in the Premier League, while Albion aim for a win that would take them six points clear of 18th.
Adam Lallana puts Albion in front, slotting calmly into the bottom left corner after ten minutes, before Iheanacho equalises on the hour mark.
Amartey fires in late on to put the visitors ahead.
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