In search of playing time, with only 10 matches played with Spurs last season, Rodon has already crossed paths with Rennes in the Europa League Conference last year.
His arrival is in addition to the signing on Friday for four years of Belgian international central defender Arthur Theate, 22, from Bologna.
"We needed two central defenders following the injury of Warmed Omari. Joe comes from a top club in England. He will bring us his experience, even if he has not played every game this season He played in the European Cup, as we could see at Roazhon Park in particular," said Florian Maurice, technical director of Stade Rennais, on the club's website.
Joe Rodon has 28 caps with Wales.
© 2022 AFP