The character (played by Mathew Gray Gubler) has suffered from unexplained migraines throughout the show's sixth season, but Messer told Entertainment Weekly that Reid's illness will be explored properly in a potential seventh season.
"Honestly, that storyline, that whole idea behind that, started before we lost A.J. [Cook] and Paget [Brewster]," she explained. "There was [also] a chance that we were fearing to lose Matthew just because of contract negotiations."
She continued: "That storyline kind of got implanted and then never truly paid off in this season, but we want to sort of conclude that next season. That's the plan."
Criminal Minds star Thomas Gibson previously insisted that the show's future is secure, claiming that many viewers are still "connected" to the crime drama.
Criminal Minds continues on Wednesdays at 9/8c on CBS.
> Criminal Minds exec teases cliffhanger