The comedy will focus on Danny (Will Forte), a man who recovers from the death of his fiancé with the help of his basketball team.
Michalka joined the comedy earlier this month, signing up to play Taryn, the girlfriend of Danny's friend Dave (Hayes MacArthur).
However, the character has been re-conceived and will now be ten years older than the 22-year-old Michalka, Deadline reports.
The actress previously starred in 2010 film Easy A and appeared in CW drama Hellcats until the show's axe last year.
Rebounding will be executive produced by Steve Levitan (Modern Family) and directed by Jason Winer (Arthur).
Stars still attached to the pilot include Malcolm Barrett (The Hurt Locker) and Matt Jones (Breaking Bad).
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