Leicester City fans are invited to join their West Brom counterparts in a minute's applause during this weekend's Premier League clash in tribute to former England striker Jeff Astle.
The family of the Baggies legend, most of whom live in Leicestershire, will be in the away end at the King Power Stadium on Saturday afternoon.
Jeff, who played 361 games for the Black Country club – scoring 174 goals – died in 2002, aged 59.
Although a coroner ruled his death an industrial injury brought on by repeatedly heading a ball during his career, his family is campaigning for football and other sporting authorities to investigate the issue more seriously.
Daughter Dawn Astle, of Measham, said they will unveil a large banner reading 'Justice for Jeff' to begin a minute's applause in the ninth minute of the game – in recognition of the famous number nine.
"We're taking the banner to every away game this season," said the 46-year-old.
"The response from home fans has been brilliant, so far, and we'd like to invite City fans to join us on Saturday."
Dawn will be attending the match with son Matt, 16, and sisters Claire, who lives in Moira, near Ashby, and Dorice (CORR), from Donisthorpe.
She said: "Obviously, we're all diehard West Brom fans, but living in Leicestershire will make Saturday's game with City extra special – like our home fixture.
"Most of our friends in Measham are also City fans and the support they've shown us has been fantastic."
Lance Tomlyn, of the Leicester City Independent Supporters Club, said: "Jeff was a great player and remembered with a lot of affection by football fans across the country.
"I'm sure City fans will be more than happy to join the Astles and Baggies supporters to support the campaign."
He added: "I think Leicester identify with West Brom as we are both similar-sized clubs with a family tradition.
"It's a great campaign and shows how, despite our rivalries on the pitch, we can all come together for causes like this as one football family."
Dawn said: "Interestingly, Dad's first game for West Brom was against City at Filbert Street. It was an midweek game and he'd only signed that afternoon so had missed the team bus.
"The chairman told him he had to make his own way to Leicester so he and mum got in their car and drove.
"The funny thing was when they got to Filbert Street Dad told security he was West Brom's new signing and was late but they didn't believe him. They thought he was trying it on.
"I think he ended up driving through the bollards!""
She added: "Then, when he walked into the away dressing room, wearing his shirt and tie and brand new green blazer with shiny brass buttons, his new teammates thought he was the bus driver. They always ribbed him over that and he never wore that jacket again.
"I think Leicester won that night, but Dad scored in the next game and his West Brom career took off."
Jeff, who died from choking with his loved ones present but powerless to help, had been wrongly diagnosed with Alzheimer's disease before his death.
His family gave his brain to medical research – and earlier this year a top brain specialist revealed that he was, in fact, suffering from chronic traumatic encephalopathy (CTE), a disease normally associated with boxers.
The Astles' Justice for Jeff campaign is calling for a fully independent investigation into the link between heading a football and CTE.
In August, Dawn and Claire met FA chairman Greg Dyke to discuss the issue.
It was followed in September by a meeting with PFA (Players Football Association) chief executive Gordon Taylor, where they were joined by England coach and former Manchester United captain Gary Neville.
Dawn said: "Both the FA and PFA promised to ensure there would be an independent study researching the effects of heading a ball on footballers.
"It will coincide with study to establish exactly how widespread CTE is among former footballers at all levels of the game."
She added: "We've made huge strides in the last few months, but
cannot afford to let up the pressure.
"The FA have made promises before, but a previous 10-year study simply petered out.
"This time we want it to be different. So many other players diagnosed with a degenerative brain disease could actually have, or had, CTE.
"That's why it's important all football fans join us. Not just to get justice for our Dad but for all the other players, many who may have played for their team."
FA chairman Greg Dyke said he believes it is important for the sport to research the issue of CTE within the game.
He said: "It is clear that we do not have enough understanding of head injuries in football, or the effects of either successive concussions or the impact of heading the ball. We therefore believe that football needs to do more to understand whether there is an increased likelihood of either dementia or other degenerative brain diseases for footballers."
The Astle family has recently set up a Justice for Jeff website, which can be found at: www.justiceforjeff.co.uk.