The Norwegian notched a first-half hat-trick at Kenilworth Road to put City 3-0 up, with Kevin De Bruyne providing the assist for each of the goals.

After Luton replied with efforts from Jordan Clark just prior to and just after the interval, Haaland notched his fourth – De Bruyne again registering an assist – and then a fifth, before Mateo Kovacic completed the rout.

Championship leader Leicester pulled off a 1-0 win at Bournemouth thanks to an extra-time effort from substitute Abdul Fatawu.

Fatawu sent a fine shot past Cherries goalkeeper Mark Travers in the final minute of the first half of the additional period.

Newcastle is also through after getting past Blackburn 4-3 on penalties after a 1-1 draw over 120 minutes at Ewood Park.

The contest went to spot-kicks after Sammie Szmodics’ 79th-minute equaliser for the Championship hosts cancelled out Anthony Gordon’s effort eight minutes earlier.

In the shootout Martin Dubravka made saves to deny Szmodics and Dominic Hyam as the Magpies prevailed.