Taron Egerton had three months of intensive music lessons before taking on his role in Rocketman, which is to be released next spring.
The Welshman said he enjoyed learning the piano so much that he plans to keep playing.
The 29-year-old added: “I’ve loved playing so much that it is definitely something that I’ll be continuing.”
The songwriter and his husband David Furnish are both producers on the musical, which tells the story of Elton's life and career.
He said he also stayed at the couple’s house and was given access to Elton’s diaries from the Seventies, which helped him prepare for the role.