Transfer experts Fabrizio Romano and Ben Jacobs are reporting the two clubs have reached an agreement over a fee for Souza.
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And now the youngster has even said goodbye to Santos in a post on Instagram.
Souza, 19, posted: "After 10 years of defending this shield, it's time to experience a new challenge.
"The last year has been intense, full of development and challenges, but even in the difficult moments, I felt the love and support of the Santos fans. I will never forget that.
"I leave the club with my head high, with gratitude for everything I have experienced."