Donnelly is currently playing Charlie Price in Kinky Boots on Broadway, a role he originated in the West End. His other West End credits include Billy Elliot, The Commitments, Memphis and The Phantom of the Opera. He has also previously understudied the roles of Jean Valjean and Javert in Les Miserables.
Stenson is best known for playing Steph Cunningham on Hollyoaks. Her theatre credits include Legally Blonde, Shrek and Dirty Rotten Scoundrels.
Further cast changes, which will take effect on 12 June, include Steven Meo as Thénardier, Karis Jack as Eponine, Jacqueline Tate as Madame Thénardier and Hyoie O’Grady as Enjolras. Hayden Tee returns to play Javert.
Paul Wilkins will continue in the role of Marius and Charlotte Kennedy as Cosette.
The full company also includes: Emma Barr, Adam Bayjou, Oliver Brenin, Ciarán Bowling, Hugo Chiarella, Andy Conaghan, Alice Ellen Wright, Sophie-May Feek, Catherine Hannay, Antony Hansen, Holly-Anne Hull, James Hume, Ciaran Joyce, Katie Kerr, Rebecca Lafferty, Jo Loxton, John Lumsden, Anna McGarahan, Jonny Purchase, Lauren Soley, Shaq Taylor, George Tebbutt, Lee Van Geleen and Danny Whitehead.
Claude-Michel Schönberg and Alain Boublil's musical is based on Victor Hugo's 1862 novel. It includes the songs "I Dreamed a Dream", "On My Own" and "One Day More".
The world's longest running musical, Les Miserables is now in its 32nd year. It originally opened at the Barbican before moving to the Palace Theatre and then its current home, the Queen's Theatre on Shaftesbury Avenue.
Les Miserables is currently booking at the Queen's Theatre until 14 October 2017.