Amartey started in a three-back system, alongside Jonny Evans and Caglar Soyuncu, and helped to keep United’s star-studded attack at bay.
Despite an early goal from Mason Greenwood, Leicester turned the match around after Youri Tielemans and Soyuncu got on the score sheet.
Substitute Marcus Rashford restored parity for the Red Devils but late goals from Jamie Vardy and Patson Daka sealed a 4-1 win for Brendan Rodgers and his Foxes.
In the aftermath of the game, Amartey was praised by several football fans for helping to keep Cristiano Ronaldo in check.
See some of the best tweets below: