Pemain pengganti Chelsea, Pedro Rodridguez berhasil membawa unggul Chelsea teoatnya pada menit ke-105 lewat sebuah sundulan memanfaatkan umpan silang N'Golo Kante.
Leicester tak berhasil membalas gol lagi di sisa waktu babak tambahan.
Chelsea menang 2-1 atas Leicester City.
Leicester City Vs Chelsea (Jamie Vardy 76'; Alvaro Morata 42', Pedro Rodriguez 105')
FULL-TIME: LEICESTER CITY 1-2 CHELSEA! (AET)
— Chelsea FC (@ChelseaFC) 18 March 2018
WE'RE THROUGH TO THE SEMI-FINALS! #LEICHE pic.twitter.com/ruRkdvPnR7
Susunan Pemain
Leicester City (4-2-3-1):1-Kasper Schmeichel; 2-Danny Simpson (33-Fousseni Diabate 106'), 5-Wes Morgan (C), 15-Harry Maguire, 3-Ben Chilwell; 25-Wilfried Ndidi, 21-Vicente Iborra (14-Adrien Silva 106'), 26-Riyad Mahrez, 11-Marc Albrighton (7-Demarai Gray); 8-Kelechi Iheanacho (20-Shinji Okazaki 68'), 9-Jamie Vardy
Cadangan: 12-Ben Hamer, 28-Christian Fuchs, 16-Aleksandar Dragovic
Pelatih: Claude Puel
Chelsea (3-4-3): 1-Willy Caballero; 28-Cesar Azpilicueta (C), 27-Andreas Christensen (24-Gary Cahill 101'), 2-Antonio Rudiger; 15-Victor Moses, 14-Tiemoue Bakayoko (4-Cesc Fabregas 46'), 7-N'Golo Kante, 3-Marcos Alonso; 22-Willian (11-Pedro Rodriguez 92') 9-Alvaro Morata (18-Olivier Giroud 105') 10-Eden Hazard
Cadangan: 37-Eduardo, 21-Davide Zappacosta, 33-Emerson
Pelatih: Antonio Conte