Volunteers are being asked to come forward to help with the research.
The first study of it's kind into the long-term health implications of playing rugby league is being done in West Yorkshire.
It's been set up by researchers at Leeds Beckett University. They want to know who retired players' health is after they have stopped playing the game.
The findings will be combined with those from the recently completed New Zealand Rugby Health project in an international effort for large scale evidence on player health post-retirement. This information will be shared with World Rugby and national governing bodies.
Volunteers are now being asked to come forward to help with the study.
In addition to completing the online questionnaires, participants can attend a free clinical evaluation at the Carnegie Research Institute, Headingley Campus, at Leeds Beckett University for a more in-depth assessment of their health.
People who are interested are asked to contact Dr Karen Hind - firstname.lastname@example.org or Ian Entwistle - email@example.com.