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Messi is due to arrive in Paris to undergo a medical ahead of completing his blockbuster free transfer.
An official confirmation is expected to take place either tonight or tomorrow, with a huge unveiling set to take place.
But PSG's Brazilian superstar has already confirmed his side's signing of the six-time Ballon d'Or winner.
Neymar has just announced Leo Messi signing on his Instagram account: "Back together". :flag_ar::flag_br: #Messi
...and Ney has been key to sign his big friend Messi. Calling him, texting him and announcing to his team-mates last weekend that Leo was coming. Now it's done and completed. :flag_fr: pic.twitter.com/hGquyN4ihe
- Fabrizio Romano (@FabrizioRomano) August 10, 2021
He's taken to social media to announce the Messi transfer on his Instagram account.
He posted an image of himself with the Argentine during their Barcelona days, accompanied with the caption: "Back together."
The 34-year-old has reportedly reached an agreement on a lucrative two-year contract, with an option to extend until June 2024.
UPDATE - Shortly after Neymar's social media post, PSG confirmed the signing of Messi.