A source close to the show says the troubled star will play a celebrity judge at Nationals, the competition that usually ends each season of the Fox hit.
The judging panel usually includes a guest star, and Olivia Newton-John and Josh Groban have filled those spots in past episodes.
Back in 2010, the show famously made fun of Lohan, joking about her multiple stints in rehab.
TV Line notes that Lohan's last stint on a scripted television show occurred in 2008 as a guest on Ugly Betty. She most recently hosted an episode of Saturday Night Live, which was panned by critics.