There was no magic of the FA Cup here. Premier League side Leicester eased through to the fifth round of the competition after a dominant half-hour in the first half proved the deciding factor.
Claude Puel's men were on the front foot from the start and quickly took the lead after nine minutes through debutant Fousseni Diabate. Peterborough blinked and it was two.
Kelechi Iheanacho capatilised on some sloppy defending on the edge of the box to take a touch out of his feet and smartly curl into the corner of the net.