The Southampton captain has been a regular in Roy Hodgson’s England squads this season and his form at St. Mary’s means he is a favourite to be included in the initial World Cup squad on 12 May.
But the 25-year-old is happy to just take things in his stride and concentrate on a good end to the campaign with the Saints before any thoughts of Brazil enter the equation.
"The squad decision is out of my hands, so I won’t be thinking about it every night when I go to bed," revealed Lallana.
"It’s a long way off, a lot of players want to be on that plane.
"If you’d told me this time last year there was even a slight possibility of making my England debut the following season, I wouldn’t have believed you.
"I couldn’t be happier with how the season has progressed, I’m just looking to finish it strongly."
Lallana, who says his first World Cup memory was “probably seeing England go out on penalties” only made his senior debut in the game with Chile last November.
He had previously been capped at Under-21 level and been selected in earlier squads, but it was his eye-catching performances as Southampton captain over the last 18 months which made it hard for Hodgson to ignore him.
And having had a small taste of it with his three caps, Lallana is determined to ensure he makes the final cut when the Three Lions boss names his World Cup squad of 23 after the game with Peru at Wembley on Friday 30 May.
Watch Lallana talk about his hopes for Brazil
"I think it’s every professional footballer’s dream," he told ShortList magazine.
"I remember as a kid watching all the big tournaments on TV with my mum and dad.
"The World Cup is the pinnacle, it’s where history is made. In a World Cup season, everyone is striving to prove their worth.
"To play for my country is the proudest I’ve ever been, with the exception of when my son was born.
"I just want to relive the moment of stepping on the pitch and make it happen as many more times as possible."
You can see England in their final home game before heading to Brazil when they host Peru at Wembley. Tickets for the game on Friday 30 May are on sale now by clicking here.