Young, who will appear in the London production through April 27 only, originated the role of Frankie Valli on Broadway in 2006, for which he won the Drama Desk, Outer Critics Circle and Theatre World Awards as well as the Tony. He also plays Frankie Valli in Clint Eastwood's imminent film version, due in June 2014.
Also joining the new company at the Piccadilly will be Matt Nalton, who will be making his West End debut as Nick Massi. Edd Post and Jon Boydon will continue as Bob Gaudio and Tommy De Vito, respectively, and Michael Watson will play the role of Frankie Valli at certain performances.
Also in the cast will be Nicola Brazil, Sophie Carmen-Jones, Thomas Goodridge, Lucinda Gill, Matthew Hunt, Mark Isherwood, Charlotte Jeffery, Ben Jennings, Stuart King, Sandy Moffat, Sean Mulligan, Tom Senior, Emma Stephens, Matt Thorpe, Graham Vick, Ben Wheeler and Rob Wilshaw.