Tracy Grimshaw's A Current Affair replacement frontrunners revealed

Channel Nine are reportedly set to announce Tracy Grimshaw's replacement on A Current Affair after the veteran journalist announced she will be leaving the show after 17 years.

The Sunday Telegraph has reported 60 Minutes reporter Sarah Abo and 2GB radio host and Friday and Saturday night ACA host Deborah Knight are in the lead for the role.

It comes after it was previously reported The Project's Carrie Bickmore was being considered along with A Current Affair stand-in host Sylvia Jeffreys, her brother-in-law Karl Stefanovic, and his Today co-host Allison Langdon.

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Some other hosts who are reportedly being considered from outside of Nine included ABC's Q+A host Stan Grant, News Breakfast's Lisa Millar, Studio 10 host Sarah Harris and former Sunrise host Melissa Doyle.

Tracy Grimshaw announces she's leaving ACA

Tracy made the surprise announcement early last month, telling viewers, "Normally right about now we'd be telling you what to expect tomorrow night but lately I've personally been thinking longer term, and I have some news that I wanted you to hear from me before you hear it from anyone else.

"I've decided to finish up with A Current Affair this year."

She continued, "It's been a big decision and before the gossip websites start telling you rubbish, I want you to know it's been my decision alone and I'm not being shoved out the door by the boys' club because I'm too old.

"I'm not too old, I'm just a bit tired. And for the record, both the boys and the girls have asked me to stay."

The host, who has been at Channel Nine for more than 40 years, shared that "she's basically been a shift worker for 26 years", taking away precious time from her family.

"I've talked to people who've made us all laugh and cry, who've shared their triumphs and their challenges and their wisdom and despair," she continued.

"And because it's your show, not mine and you get to vote each night with your remote control, you told us you wanted more of that. So thank you for that opportunity. Thank you for your loyalty. I hope I've repaid it."

She added that she'd be on air until November, after which she will take a long holiday.

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