Green - who is thought to have bonded with the Jealousy singer after they both appeared on The Jo Whiley Music Show - has now attacked Beeb bosses for overlooking the Pop Idol champion.
Speaking to The Sun, the Read All About It rapper ranted: "No one knows who Danny is. That's really s*** that they dumped Will for him.
Pro - real name Stephen Manderson added: "He would have been perfect for that job. He really knows what he is talking about when it comes to making music... I liked him."
Young previously addressed his disappointment at not landing the role on Twitter, telling his followers: "The voice came, the voice went. They wanted to go more rock.... Should have dusted off my Leather jacket! Hey ho."