(Cover) - EN Showbiz - John Travolta has admitted his pride may stop him from appearing in Glee.

The 56-year-old actor is a musical legend following his memorable starring roles in 70s films Saturday Night Fever and Grease. Despite establishing a movie career for himself away from these films in the 90s and into the millennium, the actor will be forever linked to these roles.

Following an approach by the makers of hit US television show Glee for him to make a guest appearance, John confirmed he was still in two minds whether to take the producers up on their offer.

They've asked ... But I don't know," he td ET online.

The musical show has boasted an impressive array of guests over the past year, including Britney Spears and Gwyneth Paltrow. John feels he may struggle to match the performances of such stellar stars as he would be unable to indulge in his usual pre-filming ritual.

When I do musicals I train for six to nine months sometimes a year in preparation. A show like that is an on-demand thing and I really have a criteria and pride ... I would wanna knock em' dead, and I don't think I can knock 'em dead in a week," he added. (C) Cover Media