Milan and Sweden striker Zlatan Ibrahimovic fears the thought of retiring and says he may "disappear completely" once his playing career comes to an end.
Ibrahimovic turned 40 in October but remains a key part of Milan's squad and is reportedly in talks over signing a new contract beyond the end of this season.
The former Barcelona, Paris Saint-Germain and Manchester United star has struggled with injuries this term, yet he has still featured 22 times in all competitions for Milan.
As well as helping to steer Milan to a first Scudetto since 2011, Ibrahimovic is also hoping to help Sweden to the 2022 World Cup after reversing his retirement decision last year.
And while he is still being called upon for club and country, Ibrahimovic does not intend to hang up his boots.
"I have this fear about retirement: what will happen next? I know I will have other possibilities and offers," he said at a news conference on Tuesday while away on Sweden duty.
"But this adrenaline I feel on the pitch, I know I won't find that anywhere else. That's why I'm having this panic. I'll carry on as much as possible and just enjoy it.
"We'll see when the time comes. I could take a break or disappear completely.
"We are programmed to wake up, train, go home and rest. This goes on for 20-25 years, but one day I'll wake up and have nothing planned. That will be a strange feeling."
Ibrahimovic is suspended for Sweden's World Cup qualifying play-off tie against the Czech Republic, but he will be available for the final against Poland should his side advance.
Sweden have called up Manchester United youngster Anthony Elanga for the first time, a player who is 21 years younger than Ibrahimovic.
But while hopes are high for Elanga and what he can bring to the national team, Ibrahimovic joked his country will not come close to replacing him once he retires for good.
Sat alongside new team-mate Elanga, Ibrahimovic said: "Enjoy it while I'm on the pitch, because you won't see anything like it again.
"You'll see Elanga, I say that with all due respect, but you won't see Ibrahimovic any more, so enjoy while you can."
As well as representing Milan, Barca, PSG and United, Ibrahimovic has also played for Malmo, Ajax, Juventus, Inter and Los Angeles Galaxy across a 23-year career.