Lottie Henshall is to join the cast as new character Jade, who Fiz will invite to move in with the couple after she does a good job tutoring daughter Hope Stape.
An ITV source told The Sun newspaper's Bizarre TV column: "Jade arrives as a teaching assistant from Birmingham, who Fiz asks to help Hope readjust and settle back into the family home.
"As Hope loves Jade, Fiz invites her to stay and tutor her daughter. Her character drives a wedge between Tyrone and Fiz after she moves in with them."Jennie returned to filming on the cobbles earlier this month after going on maternity leave to give birth to her second child, eight-month-old Hilda.
And the star is concerned she won't be able to learn all her lines.
Her character drives a wedge between Tyrone and Fiz after she moves in with them.
She said: "It feels a bit like going back to school after the summer holiday, I've got butterflies.
"I'm worried I don't have enough space left in my brain to learn all my lines.
"But the producers have promised I'll be eased in gently."
Hilda will be heading to the same nursery as Jennie and husband Chris Farr's first child, Albert, four, went to because there is no creche on the Corrie set.
But Jennie admits it is probably for the best because she wouldn't get much work done if there was one.
She said: "It's probably a good thing Corrie doesn't have a crèche. I'd always be disappearing from set to see her.
"We have a great support network around us too, who can help. We're very lucky."
Coronation Street airs on Mondays, Wednesdays and Fridays at 7.30pm and 8.30pm on ITV.
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