Millwall will wear a white away kit in Saturday's Championship clash with Barnsley to show their support for Prostate Cancer UK.
The Championship club have received dispensation from the Football League to wear this strip even though they are at home, in celebration of the 'Heroes in White' day associated with the charity.
Fans are being encouraged to wear white for the occasion and hundreds of T shirts commemorating the event will be on sale, with all profits going to Prostate Cancer UK, who are not only the club's sponsors, but also the Football League's official charity.
Donations from the sale of the white playing strip will also go to the charity, while players Paul Robinson, Steve Morison, Richard Chaplow, Liam Trotter and Mark Beevers are sporting moustaches to support Movember.
The hospitality areas at The Den will be decked out in white, with white flowers and even a special 'white sweet' featuring the PCUK logo will be on offer to diners.
Lions coach Neil Harris' battle against testicular cancer has been well documented and in Saturday's programme Millwall director Trevor Keyse and lifelong supporter Brian Kilgannon reveal their experiences of Prostate Cancer in the hope that other men will be tested.