Next Sunday a charity football match between Hereford United legends and Cheltenham Town legends is taking place at Edgar Street in aid of Alzheimer's Society.
"It's a fantastic charity with so many links to football," said Guinan.
"There are previous players with heading dementia and links to Alzheimer’s so I'm trying to do as much as I can through a number of events this year, and this is just one of them.
"Please, please, please come and support us. Not only will there be some fantastic players on show, I have some fantastic memorabilia including a signed Jack Grealish England shirt, a signed Harry Kane Spurs shirt and squad signed shirts from Chelsea, West Ham United and Everton.
"So please spread the word far and wide because the higher the attendance, the more money we will raise."
Cheltenham are expected to have Scott Brown, Jerry Gill, Ben Gill, Gavin Caines, Neil Howarth, Craig Armstrong, Andy Gallinagh, Jason Eaton, Grant McCann, Damian Spencer, Martin Devaney, Steve Guinan, David Bird, Shane Duff, John Brough, John Finnigan, Jerry Gill, Kayode Odejayi and Zac Guinan in their squad.
Hereford will be captained by Rob Purdie.
The game starts at 3pm. Tickets are £5 for adults and £3 for concessions.