City took the lead in the 12th minute after Jack Stephens gave the ball away inside the box and Gabriel Jesus squared for Raheem Sterling, whose first-time effort took a deflection off Tino Livramento to beat goalkeeper Fraser Forster.
Semi-finals here we come! 💪🔴 1-4 🔵 #ManCity https://t.co/NHOFuyMYFk
— Manchester City (@ManCity) 1647795324000
Southampton threatened throughout the first half and the pressure told just before halftime, when Mohamed Elyounoussi’s low cross was turned into his own net by City defender Aymeric Laporte.
The Premier League leaders went ahead again after 62 minutes when Jesus was brought down by Mohammed Salisu and Kevin de Bruyne’s penalty crept under Forster’s outstretched arm.
Substitute Phil Foden lashed home a thumping strike from the edge of the area 15 minutes from time and Riyad Mahrez completed the rout.