The godfather prequel cast

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I had heard a rumour that there is a prequel to godfather being made. But now i have found out, that it is just a rumour. But still, let us imagine that it is being made. Then if you were the director, which person would you choose for the different roles. Here is my list - Vito Corleone - Robert De Niro Michael Corleone - Leonardo Di Caprio Sonny Corleone - Ben Affleck/Matt Damon Kay Corleone - Scarlett Johannson Tom Hagen - George Clooney Clemenza - Joe Pesci What would be your star cast? Feel free to add other characters too which I have left out.