While keeping an eye on another World Cup, Tim Cahill says he's shifting focus to ensure a dream return to Millwall doesn't become a nightmare.
Australia's record goalscorer says he can't deny the romance in signing with Millwall, where his professional career began two decades ago.
But Cahill says it's not purely to earn selection in Australia's squad for Russia 2018.
"I have got to put that to the side a little bit," Cahill said of his aspirations to play at a fourth World Cup.
"I signed for Millwall Football Club and the biggest thing for me is giving my football club everything.
"It's not just coming home and telling a story, it's then kicking on to the next level."
Cahill will be presented to Millwall fans before their Championship clash against Derby County on Tuesday night.
The 38-year-old had been without since departing A-League outfit Melbourne City early last month.
Cahill said returning to Millwall, where he played 251 matches between 1998 and 2004 before leaving for the Premier League, was "a perfect move".
"It (the romance) is definitely not lost on me," he said in an interview with Millwall's website.
"I have always said that ... if I did come back to England, I would come home.
"Millwall was where I learnt my trade. It give (sic) me the most important learning curve of my life, my apprenticeship, to understand football.
"To come home to where it all started, it's emotional.
"But it's happy emotions because you wish it to happen and you want it to happen and for it to finally come to fruition, it was the perfect move."
Cahill signed alongside Millwall manager, and his former teammate, Neil Harris.
"Yes, we're mates," he said of Harris.
"But also, it's business.
"He (Harris) understands that it's a results game for him. And I understand that as a player, there's levels that need to be met.
"I have had a great career as a footballer but to come here now, at this stage of my career, with so much at stake ... with eyes on a World Cup as well, it's such a great place to be."
Cahill's move comes just days after the appointment of Dutchman Bert van Marwijk as the Socceroos' new coach.
And Cahill said his age should be irrelevant at Millwall and the Socceroos.
"I pride myself on being somebody that leaves no stone unturned when it comes to taking care of my body and reaching those levels to continue at my age to keep playing," he said.
"You want to make an impact ... it's not really about playing as many games as I can, it's about making sure that I can contribute.
"This is what I love about it. Age comes out of the equation and it comes on ability."