Before the end of the season, "Lindsay will be appearing in an episode of Glee," says rep Steve Honig.
As for her role, according to reports she may play herself, as a judge at the Nationals.
Having honed her comedic chops hosting Saturday Night Live earlier this month, Lohan, 25, will be the latest in a string of guest stars to appear on the Fox show.
The casting news may come as a surprise to some, especially because Lohan has frequently been the target of jokes on Glee.
But this could also be good news for the troubled starlet, who was involved in a car accident earlier this month and is scheduled to receive her final probation report, stemming from previous DUI and necklace theft incidents, on Thursday.