Swindon Town are searching for a six-year-old fan who said he could not go to matches because his mum "has no money for food".
The boy - named only as Joe - sent a letter to the club's forward Harry McKirdy.
He taped a 20p, 5p and 1p coin to the scrap of paper, which he asked to be given to the player who made headlines last month when he scored against Premier League champions Manchester City.
The letter read: “Mummy doesn't have any money to come to Swindon games because she has no money for food and has to pay for my dinner at schol [sic].
“I like Swindon Town Harry McKidy.
“I will come one day.
“Joe Aged 6 1/2”
He attached the change to the letter with the note “for Harry”.
Swindon are now enlisting the help of their supporters to try to identify who wrote the letter, which arrived with no postage paid.
Thousands of pounds have since been raised for the family after a fundraiser was set up for Joe.
The club wrote in a tweet: “We have received this letter from Town fan Joe, aged 6 and a half.
“We’d really love to get in touch with Joe, but we don’t have a return address.
“If anyone recognises the writing or thinks they know who Joe is, please email firstname.lastname@example.org”
McKirdy was recently named the PFA player of the month for League Two after netting six goals in the competition in January, including four against Northampton on New Year’s Day.
He also scored the Robins’ consolation goal in their 4-1 loss to Manchester City in the third round of the FA Cup.