In a trading update today, the group, which publishes the Daily Mirror and several regional titles, said advertising revenues for the nationals division were likely to fall by 12.1% for the six months to 2 July.
This would reflect a 12.7% decline in the UK national titles and a 10.5% decline for the Scottish national titles, it said.
In the regional division, the publisher said like-for-like advertising revenues would fall by 9.7% for the period.
With the exception of property advertising, which is expected to increase by 1.9% for the period, the publisher said it expected all advertising categories to decline with falls of 6.7% for display, 21% for recruitment, 12.9% for motors and 3% for other classified categories.
Trinity Mirror will publish its interim results on 3 August.
This would reflect a 12.7% decline in the UK national titles and a 10.5% decline for the Scottish national titles, it said.
In the regional division, the publisher said like-for-like advertising revenues would fall by 9.7% for the period.
With the exception of property advertising, which is expected to increase by 1.9% for the period, the publisher said it expected all advertising categories to decline with falls of 6.7% for display, 21% for recruitment, 12.9% for motors and 3% for other classified categories.
Trinity Mirror will publish its interim results on 3 August.