In his 20-year association with the Blaugrana, this is the closest Messi has came to leaving after becoming unhappy with life at the Camp Nou.
Barca have regressed poorly on the field, failing to win a piece of silverware for the first time in 12 years, while they were humiliated in the Champions League after a damaging 8-2 demolition by Bayern.
After that match, Quique Setien was sacked and replaced by Ronald Koeman, who subsequently told Messi's friend, Luis Suarez, that he was no longer wanted at the club.
A few days later, the six-time Ballon d'Or winner stunned European football by sending a fax to Barcelona requesting that he be let out of his current contract to allow to him speak to other clubs.
He currently has a release clause in his contract to the amount of €700m.
He previously had a clause allowing him to leave for free this summer will allegedly expired at the beginning of June. However, Messi and his camp believe that the clause remains legal due to the fact that the season was extended due to the coronavirus pandemic.
Messi intends to meet with the Barcelona board and club president Josep Maria Bartomeu to discuss how an exit can be negotiated, but the player will also have his lawyers present to outline the legality of his release clause.
Should he be allowed to leave, the stronger suitors for his services are thought to be Inter and Manchester City.