He joins the existing company that features Edd Post as Bob Gaudio, Jon Boydon as Tommy DeVito and Matt Nalton as Nick Massi. Sandy Moffat will play the role of Frankie Valli at certain performances.
Watson's previous West End credits include We Will Rock You, Imagine This, Sister Act and Shrek the Musical.
To book tickets, which are currently on sale through Feb. 15, 2015, contact the box office on 0844 871 7630 or visit www.jerseyboyslondon.com