Einstein's Stadium Trivia

My friend is very sensible. I'm not going to name him, but he got in a bad way on it. He came back, trying to have a fight with Roninke in the singer. Bad, bad, bad experience. It's rice wine in it, Raki. It's dodgy stuff. OK, right, there we go. This is from Einstein who says, here's some stadium trivia for you. And in Mitten's eyebrows, I've gone up straight away. In the summer of 1981, United played a team whose most famous supporter was once offered the chance to replace Peter Gabriel as Genesis's singer. Who is the singer and which player has represented both