Trinity Mirror, the company that publishes the Daily Mirror, is mulling a bid for certain assets belonging to newspaper group Northern & Shell.
Northern & Shell's newspaper titles include the Daily Express, Sunday Express, Daily Star and Daily Star Sunday.
Trinity Mirror reacted to a report in the Times of London, that it could buy the Daily Express newspaper.
Trinity said it was at an early stage of evaluating assets and that a deal was uncertain at this time.
In a stock market announcement, it said it was evaluating "certain...assets" owned by Richard Desmond's Northern & Shell, adding "there is no certainty that any agreement will be reached in respect of the range of outcomes currently under consideration."
Desmond, who made his fortune in pornography magazines, has asked for more than £100m for the Daily Express and Sunday Express. He initially bought the company for £125m in 2000.