We are talking about testicular cancer, a disease that needs to be tackled by all of us.
You may already know about Neil Harris of Millwall and other players who have been treated and having recovered, are back playing football.
This is the most common form of cancer among 20-35 year old men. But if discovered early enough 90% of cases can be cured.
For two weeks we are teaming up with two charities, everyman and Dads & Lads, to encourage you to 'Keep Your Eye on the Ball'. Visit their websites to learn more facts and see how you can lend your support.
The F.A. and P.F.A. websites will tell you more of why this campaign is so relevant to football. And by tuning into TalkSPORT Radio 1089/1053 AM you will be able to hear other famous footballers talk about it too.
'Keep Your Eye on the Ball' is the call from The F.A. and P.F.A. to all the football clubs of England and Wales. But from the 4th to the 17th of March this applies to you the fans and not just the players and clubs. Intrigued?