Following a two-year spell with L'OM, the 24-year-old joined the Magpies in 2015 but was soon back at his old club on loan in January 2016 after failing to impress at St James' Park.
He began the current campaign on loan at the Ligue 1 outfit, with a clause in his contract that meant he only needed to start three games before the club had the option to seal a permanent deal.
It seems as though that is now the case as the former France Under-21 ace confessed that he will not be returning to Tyneside.
However despite scoring just one goal from 16 outings in all competitions for the north-east side, Thauvin believes he returned a better player for the experience.
"It was a loan with an automatic purchase," he told RMC Sport. "After three games I belonged to Marseille so it was almost a transfer. No doubt, I’ll be at Marseille next season.
"My season in Newcastle, even if it was complicated, did me good. It made me grow up and I became another man on my way back from England.
"I’m 24 years old now. It’s been a while since I’ve been working on myself to be consistent at every game. My visit to England made me feel good and made me understand certain things about high level requirements."