Millwall boss Neil Harris has stated that things with Tim Cahill have been "left open" as the Australian prepares for a fourth consecutive World Cup appearance in Russia this summer.
The Lions legend returned to The Den in January's transfer window and made 10 appearances, becoming a big influence on and off the pitch as Millwall went on a 17-match unbeaten run that nearly ended in a third consecutive Play-Off campaign.
The 38-year-old has returned home to New York in advance of joining up with The Socceroos ahead of the World Cup, but Harris told millwallfc.co.uk that an "ongoing conversation" may take place once the tournament is over.
"When Timmy came in, it was his desire to come back and play for the club and for me, what got him here in the first place," he said.
"It certainly wasn't a financial gain for him, that's for sure. He came in with no airs, no graces and no promises from him to me or me to him about anything other than this season.
"His goal was always to realise a dream of coming back to play for Millwall, to come and work with me and Dave Livermore and to help us move forward as a club, but also for him to get himself to the World Cup in great physical condition.
"Whether that was through minutes in the first team, in the 23s, in training games, whatever it was, to help him evolve as well. He's certainly done the first part by helping us move forward. We thank him for that.
"Secondly, is he going to get to the World Cup? Time will tell. If I was the Australian manager, he'd be the first name in the squad list because of what he brings off the pitch as well as on it.
"How we've left it is that he's got a World Cup to hopefully go and prepare for and then he's got to think about what the bigger picture holds for him. What we have to remember is that his family are from Australia, live in New York and he's in London. That's not an easy relationship to have.
"We've left it open - do I expect to see Tim Cahill come back and play for us next year? I'll be surprised, I've got to be honest. But I would never rule anything out. Our relationship is really strong, I've loved having him here. Will he be back in the future working? That's a possibility as well.
"What I do know with Tim is that he is in great physical condition - top, top shape. He's an excellent character in the dressing room and has a lot to offer in football around the world. Whether he wants to go and play 90 minutes every week or whether he wants to be part of a group where he can have an input as an impact sub or in the dressing room then he'll have a lot to offer at various clubs around the world as well.
"It's an ongoing conversation, but probably not one that's going to take place between me and Timmy until well after the World Cup."