Hollywood actor Tom Hanks is convinced he will forget his lines on the opening night of his Broadway play.

The Forrest Gump star is making his Broadway debut in Nora Ephron's Lucky Guy, which opens at Manhattan's Broadhurst Theatre on Monday night (01Apr13).

He has been appearing in previews of the play over the last month, but is still worried about forgetting his lines.

Hanks tells the New York Post, "Am I nervous? God, yes. Nothing but nerves. The heart starts beating. You get more wired, but you can't allow yourself fear. That's a disaster scenario. Like, if your brain takes an unfortunate left turn and it's... 'What's that line?' Of course, it'll happen you forget. You have to trust. Somebody'll give you a nod or throw you a cue."

Hanks also reveals he has been spending up to 10 hours rehearsing and can't quite get used to his new schedule.

He adds, "Working onstage is very physical. The rehearsal process, not just memorising, the task of learning the play is 10 hours a day. Moving your body into place requires stamina. In performance, you learn to sleep late, decompress, exercise, eat lightly and early. Helen Hunt told me, 'You must have dinner at 5:15.' 5:15!"