The 24-year-old, who starred as Ron Weasley alongside Daniel Radcliffe, 23, and Emma Watson, 23, in eight Harry Potter films, has performed in a workshop for Butterworth's 'Mojo', reported Daily Mirror.
Grint attended the play reading held by Ian Rickson, who directed the original 1995 Royal Court production, with a cast that included 35-year-old actor, Daniel Mays and Robert Sheehan, 25, of the E4 drama 'Misfits'.
The gritty drama is set in Soho, London, in 1958 and focuses on a handsome rock star who gets caught in dodgy dealings involving a gangster, a club owner and band manager.
Radcliffe went on to star in a new Broadway production of 'How to Succeed in Business' in 2011 and can currently be seen in West End play 'The Cripple of Inishmaan'.