It follows rival News International's decision to place The Times and the News Of The World's web content behind paywalls.
Executives at parent group Trinity Mirror are finalising which content to charge for on mirror.co.uk and sundaymirror.co.uk. Final details of the strategy are expected to be confirmed later this year.
Daily Mirror columnists, including political writer Paul Routledge and sports columnist Oliver Holt, will provide the foundation for the title's premium content strategy. However, the Daily Mirror's general news will remain free.
Mark Hollinshead, managing director at Trinity Mirror's nationals division, said: "Our view is that people will not pay for ubiquitous content that is free elsewhere. But there may be a willingness to pay for unique, high-value content."
In the past, Trinity Mirror has actively sought to protect its digital content from news aggregators such as NewsNow.
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