The first is the 36pp RPSport, which will offer betting tips and coverage of cricket, rugby and football.
Chris Smith, the title's editor, said the 200,000 run was the biggest single change to be made to The Racing Post since its launch nearly 20 years ago. Trinity Mirror's second project is Your Life, a 12pp supplement to the Daily Mirror. The title, which has a print run of 2.9m copies, will feature real-life stories and articles on shopping and fashion.
Both supplements are tabloid sized and will appear with the Saturday editions. They will be produced at Mirror print sites in Watford, Oldham, Cardonald, Birmingham and Ireland.