Lallana was handed a shock call-up to the England squad for the friendlies against Germany and Chile, and he responded with two encouraging performances.
Roy Hodgson praised Lallana following Tuesday's 1-0 defeat to Germany and the England manager admitted that he now considers the midfielder a serious contender for a place in his 23-man World Cup squad.
And having realised his boyhood dream of playing at Wembley for England, Lallana is keen to make sure he now forces his way onto that plane to Brazil next summer.
"Playing in the two games has given me even more drive to go back and perform week in week out with Southampton because I'm desperate to be in the next squad and get to Brazil," Lallana said.
"Playing at Wembley for England is something I have always dreamed of.
"The hairs on the back of my neck stood up when I walked out in front of a packed crowd. To get two caps at Wembley against tough opposition is a proud moment for me and my family but I don't want that to be it. I want more.
"It's a step up in quality, but it's where I want to be.
"International football is the pinnacle, it's where the best football is played and this experience makes me hungry for more.
"It has been a pleasure training and playing with these top players day in day out and hopefully it won't be the last time."
England have a wealth of options in midfield, both out on the flanks and in the centre.
Versatility could help Lallana in his quest to make the cut for Rio, however.
The 25-year-old operated on the left wing during England's two games, but he can play anywhere across the midfield and he will not be fussy about where he plays.
"I am happy playing anywhere for my country," the Southampton captain said.
"I have played left and right for my club so I don't feel I have to adapt at all."
Hodgson watched Lallana score an impressive goal against Hull a fortnight ago and the England manager will no doubt be keeping a close eye on the player, as well as his Southampton team-mates Jay Rodriguez and Rickie Lambert, in the coming months.
Southampton are riding high in the Barclays Premier League after a superb start, but they will face a big test of their top-four credentials at Arsenal this weekend.
Still, after beating Liverpool at Anfield and taking a point from Manchester United away, Lallana sees no reason why the Saints cannot pull off another shock result.
"It's a massive game - top versus third," he said.
"But we have got results at Old Trafford and Anfield so why can't we go there and get a result?
"The lads will be full of confidence and I am really looking forward to it."