Sterling became close to the youngster before he died of leukaemia, and also supported the campaign by Dawkins’ family to find a suitable stem cell donor for him.
The 24-year-old former Liverpool player is due to attend the service in Dagenham on Friday.
“Damary was a special young man who touched a lot of lives, including my own. Positive until the end, he was an example to us all,” Sterling said.
Sterling paid tribute to Dawkins by lifting his shirt to reveal a picture of the two of them together following his second goal in England’s 5-0 defeat of Czech Republic last month.
Dawkins’ father has previously discussed the relationship between the player and his son.
“I knew that they used to speak because [Sterling] came down to the hospital, they played pool together and apparently they swapped numbers,” he told the Press Association last month.