The Reds laboured a little to victory against the Hatters at Kenilworth Road, until late goals from Marcus Rashford and Mason Greenwood added gloss to the scoreline.
But, afterwards, Ighalo was keen to pinpoint the confidence the squad will draw from getting our first win of the season.
“It was a very tough game,” said the Nigerian attacker. “We knew, from the start, that we were coming to play a tough side. We are happy we are going through to the next round - that is the most important thing. “We've not started the league very well, but we've won today and I think it's a boost for this weekend's game against Brighton.