Lee Foster, 24, died on 9 April after losing his 15 month battle with skin cancer, prompting Rachel Murray, his girlfriend of two years, to start the campaign.
The 'A-Team' singer, who is known for being adorably kind and visiting needy fans, will need to check his schedule as he'll be playing in South America just two days after the funeral.
Stars such as Jamie Carragher have already jumped on the #SingForLee hashtag.
Murray told the Liverpool Echo: "Lee was just a normal lad. He was fun-loving and loved life. He had a constant battle with cancer for 15 months but was so positive the whole way through. You wouldn’t even know he was ill.
"He absolutely loved Ed Sheeran. He was listening to him in the hospice before he died."
The 22-year-old British Airways cabin crew member said Foster would often joke Sheeran was "his fellow ginger".
"He was always smiling, always laughing. He was always active and loved going to the gym. It wasn’t until January this year he started to slow down because of the illness and you still wouldn’t even know he was ill.
"It would mean so much if Ed sang at his funeral."
2. Refusing to dye his hairIn the early days of his career, Ed was advised to dye his hair by record executives, but he stuck to his guns... and it turns out that was definitely the right thing to do! (credit:Tim P. Whitby via Getty Images)
Ed Sheeran's Most Lovable Moments(02 of09)
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4. Crying at the end of 'The Notebook'Tissues at the ready should you ever be lucky enough to watch a rom-com with Ed Sheeran - during an interview he once revealed the last time he'd cried was at the end of 'The Notebook'. Ed, if you're a bird than we're a bird. Or whatever that bird-related quote is. (credit:Chelsea Lauren via Getty Images)
Ed Sheeran's Most Lovable Moments(03 of09)
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5. Hanging out with his 'best friend'Not sure if we're more jealous of Ed or Kermit to be honest with you. (credit:Instagram)
Ed Sheeran's Most Lovable Moments(04 of09)
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6. His 10/10 comeback to Noel Gallagher.How did Ed cope with rock royalty claiming he "didn't want to live in a world where Ed Sheeran sells out Wembley Stadium"? Shouting? Screaming? Embarrassing Twitter shade?No, Ed stayed calm and collected. And offered Noel free tickets via text, of course. Classy. (credit:Dave J Hogan via Getty Images)
Ed Sheeran's Most Lovable Moments(05 of09)
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7. Throwing a suit on for Victoria's SecretTrue, we love Ed in a plaid shirt and jeans, but he certainly scrubs up well too. (credit:Pascal Le Segretain via Getty Images)
Ed Sheeran's Most Lovable Moments(06 of09)
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8. Serenading a terminally ill fanAfter Ed learned that it was one of his teenage fan's dying wishes to have him perform for her, he telephoned her directly as she lay in her hospital bed and performed his song 'Little Bird' for her, which her brother claims "sang her to sleep". (credit:Karwai Tang via Getty Images)
Ed Sheeran's Most Lovable Moments(07 of09)
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9. Defending Taylor SwiftLike every famous person ever to exist, Ed is close pals with Taylor Swift, who he collaborated with on the duet 'Everything Has Changed'.When a journalist asked him what he thought about her reputation as a serial dater, he fired back: "I don’t like when people take shots at her because I do know her personally and I think people get the wrong end of the stick. "She’s so successful and she’s so nice and sweet to everyone that she meets, there is nothing bad to say but she was being pictured with a lot of dudes!" (credit:Ian West/PA Wire)
Ed Sheeran's Most Lovable Moments(08 of09)
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10. Literally every single time he's been photographed with his catThere is so much to love in this photo, we're not even sure where to start. (credit:Instagram)
Ed Sheeran's Most Lovable Moments(09 of09)
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10. Dressing up as Austin PowersWhy not, eh? (credit:Instagram)