Both sets of fans are set to pay tribute to Stan Bowles during the televised derby between QPR and Brentford.
The Rangers legend, who starred for Brentford towards the end of his career, is suffering from Alzheimer’s disease.
His condition has worsened recently and fans are being urged to show their support with applause for Bowles in the 10th minute of tonight’s game.
“Stan’s health is deteriorating. He’s not going to get any better. That’s the nature of his illness unfortunately,” Rangers manager Ian Holloway told his club’s website.
“We want both sets of fans to show their respect to him in the tenth minute – he wore that number 10 with so much personality.
“I’m sure you’ll see both sets of fans give him the respect he deserves and those fans who watch the game on TV, who maybe don’t even know who Stan is, will certainly know afterwards.
“The bloke was an absolute genius but he was more than that – he’s a great man.
“We’re coming up to the festive period which is a lovely time of year – all of QPR’s thoughts are with Stan and his family.”