Temisan Williams was invited to appear on talkSPORT, where he was described as "Dowman's former coach".
Despite insisting to have been "a small part of his journey", Williams' appearance on the radio station annoyed the youngster's father.
Robert Dowman wrote on X: "Listening to this guy Temisan Williams claiming he was any part of Max’s journey is a really a sad piece of attempted self promotion. I have asked him previously to refrain from doing so but still he pops up on Talk Sport this morning…
"I remember him putting the cones out at training a few times but that’s about it. We have so many fabulous coaches who we are so grateful to. He is certainly not one of them……"
Williams, in response, posted on X: "Following Rob Dowman’s comments today: I have spoken with Rob Dowman and apologised to him and his family. Going forward, I will not be discussing Max Dowman’s development. I wish Rob Dowman and his family nothing but continued success."
Dowman,16, become the youngest goalscorer in the Premier League with his strike in victory over Everton on the weekend.