Diomande has reflected on the loss of his sister, who was a key figure as he tried to make it as a professional in both Europe and the US.
She died last year after being spiked at a party, as he was living away from his loved ones, playing for Spanish side Leganes which will have made the loss even harder to take as he was away from family.
Speaking on the loss, Diomande admits that he is still struggling emotionally after such a devastating incident.
“I used to have emotions. Now, I don’t feel anything. It’s like I’m not even human. Since you died, I’m just blank.”
“All I can do is use the pain to work harder, and to do everything we dreamed about. I want you to know that I will make sure that you live on. I will make sure that everybody knows your name. The whole world. Everything I do on a football pitch, it’s for you.”
Diomande's touching tribute
Diomande also wrote in an emotional open letter on The Players’ Tribune:
"Someone kept calling me from back home. I was annoyed. I didn’t understand why they kept calling me. I picked up, and they didn’t even soften it. You know how it is back home. No emotions. Just……..
'Your sister is gone.' 'What?' 'She died.' 'What are you talking about?' 'Somebody put something in her drink at a party, and she never woke up. She is gone.'
"You were 15. 15.
"I never got any answers. I don’t know if I want to know why. Maybe it was jealousy. Maybe it’s just something that happens in our country. Maybe I could have protected you. I don’t know."
The 19 year old is among the most sought-after young talents in football after a stunning debut season with German club RB Leipzig. Although there is excite growing around the teenager, the loss of his sister will weigh heavily on him throughout the rest of his career.