"Looking forward to directing and Producing The incredibly talented Michael B Jordan in Creed 2 next year," Stallone wrote alongside a photo of himself and Jordan.
"One more Round ! #creed2 #mgm #fighting #workout #exercise #boxing," the actor continued.
Creed, released in November 2015, centered around Adonis Creed (Jordan), the son of Rocky series regular Apollo Creed, who enters the boxing world by training with Stallone, who reprised his role as Rocky Balboa.
The film from director Ryan Coogler, based on a script he co-wrote with Aaron Covington, earned $173 million worldwide. Stallone was nominated for the Academy Award for Best Supporting Actor and won the Golden Globe in the same category for his return as Rocky.
Previously, Stallone wrote the screenplays for all six Rocky films and directed Rocky II, Rocky III, and Rocky IV, which featured the death of Apollo at the hands of boxer Ivan Drago and Rocky Balboa.
Stallone and Dolph Lundgren, who portrayed Drago, previously hinted on social media that the character would be returning in Creed 2.