The actress told TV Line that future episodes will explore the relationship between Will (Josh Charles) and private investigator Blake (Scott Porter).
"Will is dealing with demons," explained Margulies. "We're about to find out why Blake was in his life [years ago]."
Margulies, who plays Alicia Florrick, also suggested that her on-screen husband Peter (Chris Noth) could be looking for revenge after her character slept with Will.
"I have a feeling that Peter is going to go after the Will Gardner character," she teased.
Margulies recently revealed that she is keen to explore new facets of Alicia in the third season of The Good Wife.
The series will return to CBS on Sunday September 24 at 9/8c.
> Lisa Edelstein to join The Good Wife
Watch a clip from The Good Wife's second season finale below: