Among others, the French sports magazine L'Équipe and transfer journalist Fabrizio Romano state that Messi and PSG have agreed on a two-year contract, with the possibility of extension for another year.
According to the usually extremely well-informed Romano, his salary should be around 35 million euros (almost 358 million kronor) per season.
Messi, who will of course undergo a medical examination before the contract is signed, is expected to arrive in Paris in the afternoon.
Last week it was clear that Lionel Messi will leave Barcelona after 21 years. The Catalan club is heavily indebted and when they tried to renew the star's contract, La Liga's financial regulations came to a halt.