Hiring and firing

illinois: i am on short term disability. a week after surgery, i received in the mail a termination package from my job.
I was told it was a mistake. I was not terminated.
question: when i go back to work, can they legally
terminate me??

Is Illinois an "at-will" state? If yes, they can terminate your employment, at any time, with or without notice. It becomes suspicious, and borders on employer violations, when they "wrongfully" terminate you simply for having a disability, especially if the disability does not affect your work performance.

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I am a law school graduate. What I offer is mere information, not to be construed as forming an attorney client relationship.