Ainsley Maitland-Niles was sent off as we suffered another blow to our hopes of a top-four finish.
Our right back received a yellow card early in the first half and was dismissed after a second bookable offence before half-time.
It had been tough enough with 11 men - James Maddison and Youri Tielemans pulling the strings for Leicester - and Bernd Leno kept us in contention with a series of top-class saves.
Our goalkeeper denied Maddison, Jamie Vardy and Wilfried Ndidi, but he was finally beaten when Maddison’s perfect cross was headed in by Tielemans.
We had a few glimpses of goal, Alex Lacazette and Alex Iwobi spurning our best chances before Maitland-Niles was sent off.