His return was teased by star Vin Diesel recently along with Jordana Brewster.
"On the road back to our roots... Family reunited!," Diesel captioned the picture with Lin and Brewster.
During a Facebook Live on Wednesday, Diesel revealed he's working on something "top secret" involving the director and the actor.
Describing Lin, who directed the third, fourth, fifth, and sixth installments, as a "forefather" and "architect" of the series, he hinted that the filmmaker will be returning for the final two films.
Brewster, who is one of the original Fast members, was absent from April's "Fate of the Furious".
"Fast 9" will release on April 10, 2020.
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