By Rory Gallivan

LONDON--U.K. newspaper publisher Trinity Mirror PLC (TNI.LN) on Monday reported a deterioration in print advertising sales in recent weeks, as supermarkets such as the troubled market leader Tesco PLC (TSCO.LN) held back on marketing spending.

Trinity, which publishes the national tabloid The Mirror and local titles such as the Liverpool Echo, Monday reported total revenue down 5% so far in the second half compared with last year, worse than the 2% decline experienced in the first half.

But the company said it still expects full-year profit to be in line with previous predictions, helped by cost-cutting initiatives.

The weak trends recently have been "driven by weaker national display advertising, in particular supermarket spending," said Trinity, adding that advertising has been volatile from month to month.

"The biggest year on year on change has been Tesco ... so perhaps there is a link between poor performing supermarkets and supermarkets not advertising with us," Chief Executive Simon Fox said during a call with analysts.

Tesco earlier this year said it had discovered issues in its accounting and is now being investigated by U.K. fraud authorities.

"We still think press is by far the quickest and most effective way to get price messages out there and therefore we clearly remain optimistic that they will return to the fold," Mr. Fox said.

He added that the company is well placed to continue growing online advertising revenue strongly, helped by initiatives such as introducing advertising into smartphone apps next year. As with other publishers, online advertising currently accounts for a small proportion of online advertising at Trinity Mirror, but is growing fast.

Shares at 1057 GMT, down 5 pence, or 3%, at 161 pence valuing the company at GBP414.9 million ($658.7 million).

-Write to Rory Gallivan at rory.gallivan@wsj.com; Twitter: @RoryGallivan

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