The 24-year-old struggled for opportunities at St James’ Park after joining the Magpies from Marseille on a five-year deal in August 2015 when he arrived for a fee of £15million.
After ending the 2015/16 season back at his former club, Thauvin returned this term and has netted 10 goals to win a maiden call-up to the France squad.
And, speaking to RMC Sport in his homeland, Thauvin revealed he only needed to start three matches for Marseille to secure a permanent transfer.
“It was a loan with an automatic purchase,” he said.
“After three games I belonged to Marseille so it was almost a transfer. No doubt, I’ll be at Marseille next season.”
Thauvin featured 16 times for Newcastle, scoring just one goal.