Editor Mark Thomas said 'a bumper Post once a week ... will be better for readers and a more appealing vehicle for advertisers'
In a release the company said the move to weekly publication for the title, which the company says has been "serving our city for 156 years", will be published on a Thursday with a "working title" of the Liverpool Post.
Responding to the news the National Union of Journalists says it "condemns the cuts".
In the company release editor Mark Thomas said "a bumper Post once a week ... will be better for readers and a more appealing vehicle for advertisers".
"We’ve just completed research which proves yet again how much people like and want our current content mix," he adds.
"However, we appreciate that the world is changing and people’s buying habits and news consumption requirements are very different."
The company emphasised that this will have "no impact" on the Liverpool Echo, which will remain a daily publication.
In the same announcement the company also detailed changes to its free Liverpool weekly titles, including the Bootle Times, Merseymart (South) and Star (Anfield & West Derby plus Maghull), which will be "merged into two new community newspapers – the Star and the Merseymart".
"These two new editions will be carried to the market within the Tuesday edition of the Liverpool Echo," the release adds.
"We recognise that the proposed changes are fundamental and that they affect long-lived and much-loved brands," managing director of Trinity Mirror North West & North Wales Warren Butcher added in the release.
"However, a change in approach is vital. Our business has been built on the ability to be proactive and to continually adapt our portfolio to reflect market conditions and changing consumer trends. We are convinced these changes will strengthen and add greater relevance to our portfolio in the long term and in turn improve the service we provide to both readers and advertisers."
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