Southampton defender Virgil van Dijk admits they're brimming with confidence.
Saints have gone seven-and-half hours without conceding in a five-game unbeaten run.
He said: “Sunday is going to be a massive game and hopefully we can keep this good run going.
“Leicester are a great opponent and I am going to be ready for it. I am looking forward to it.
“The defenders are not defending by themselves. I think it starts up front and everybody can be proud of themselves."