Just two years after leaving for Paris Saint-Germain in a sensational €222 million (£200m) transfer, Neymar could make a remarkable return to Barcelona.
The Brazilian forward, who is currently recovering from injury, wants to leave the club and started the summer by failing to attend the French champions' first day of pre-season training.
Neymar's father later claimed the player had permission for his absence only for sporting director Leonardo to confirm that the forward was free to leave for the right offer.
Barcelona are actively pursuing a sensational return for Neymar, and are fearful of competition from Real Madrid, although there is a lot still to be resolved before the summer window closes next week.
Here's what we know so far...
Do Barcelona really want him?
Yes. President Josep Maria Bartomeu has previously said that Neymar was a good player, but that PSG did not want to sell the Brazilian. "There is no Neymar case," he added, and the club chief repeated those words soon after.
Leonardo then claimed that there had been "superficial contact" with Barca over Neymar. Lionel Messi would like Barca to bring Neymar back in order to boost the team's hopes of winning the Champions League for the first time since 2015.
Standard Sport understands Bartomeu has been working hard to put together a deal for Neymar amid fears that rivals Real Madrid could beat them to his signature.
The Brazilian was not named in the matchday squad for PSG's comfortable 3-0 win over Nimes as the Ligue 1 season resumed at the weekend, with Edinson Cavani, Kylian Mbappe and Angel Di Maria all on the scoresheet.
Is the deal close?
Not exactly. Negotiations between Barcelona and Paris Saint-Germain have been anything but straightforward but president Bartomeu has been working hard on the deal and there is hope an agreement can be reached.
"Conversations are more advanced than before," Leonardo told journalists on August 10. "But there is no agreement [yet]. We want a clear line on the matter and it's important to define it as soon as possible." However, he did not confirm he was talking about Barca.
The French champions are unlikely to recoup their world-record €222m investment of two years ago, with Barcelona likely to offer players plus cash for their former forward.
Philippe Coutinho was touted as being included in the deal but could now be set to join Bayern Munich, leaving central defender Samuel Umtiti, right-back Nelson Semedo and midfielder Ivan Rakitic as other possibilities.
What do the fans think?
The fans are divided over the prospect of bringing back Neymar. Many have not forgiven the player for the nature of his departure in 2017, although others remember how good he was during his four years as a Barca player.
On social media, the reaction appears to be more negative than positive, with many unwilling to forgive the Brazilian for how he left the club and others uncomfortable with his off-field behaviour, which includes a recent rape allegation.
Local fans are more split and many would welcome him back, believing—as some of the players and international supporters do—that he would give the team a better chance of winning the Champions League.
Is it a good idea?
Time will tell. Neymar is still a wonderful player and if he can find the form he showed during his first spell at Camp Nou, the move could be a success.
But going back is often not a good idea and it is worth noting that the forward is increasingly fragile now, having suffered a number injuries since he moved to Paris Saint-Germain.
That would be a concern, along with his off-field behaviour and all the baggage he brings. If he is brought back, Barca would want him to be professional, but there is no guarantee that would be the case.
In addition, there are question marks about how it would work tactically with Griezmann, Messi, Luis Suarez and Neymar all at the club. The jury, at this point, is very much out.
