The 26-year-old is the subject of a £20m bid from Liverpool, and could depart St Mary’s this summer, but no agreement has been reached to sell him yet.
Lallana has previously stated he would like to end his career at Saints, but has adopted a more measured tone when discussing his future in recent weeks.
The expected departure of manager Mauricio Pochettino to Spurs this week will only heighten speculation that the midfielder has already played his last game for the club.
But the Saints academy graduate is currently away with England, as part of their squad for Brazil, and he says that is his only focus right now.
Speaking on behalf of Vauxhall, the England team sponsor, Lallana said: “Whether my future gets sorted before or after the World Cup makes no difference to me.
“I am just fully focused on doing well for England and performing as well as I can.”
Lallana, who was voted into the PFA Team of the Year this season, could have departed Saints when the club slipped into administration and were relegated to League One in 2009.
But he opted to remain and continue his development at St Mary’s – something he has no regrets over doing.
“I wouldn't change anything,” he said. “Part of my development was playing those (lower) league games.
“It has helped me physically, and with different aspects of my game.
“Four years ago I was playing in League One and I was watching the World Cup with my mates.
“If someone had said to me then I would be participating in the next one, obviously I would have not believed them one bit.
“That just proves what can happen when you work hard and get your head down.
“I’m delighted and I still can’t quite believe it.”
Lallana, who was handed his international debut earlier this season, is expected to play a key role for England in Brazil.
He and his Saints teammates Rickie Lambert and Luke Shaw are among 17 players in Hodgson’s party who have never been to a World Cup before.
Lallana thinks that raw inexperience will prove to be a help, rather than a hindrance.
“A lot of us haven’t been to a World Cup before. Hopefully that means we’ll go there with no fear,” he said.