D.J. Caruso "dreaded" the fast turnaround of 'I Am Number Four'.

The director - who worked alongside Alex Pettyfer and Dianna Agron in the teen action movie about an alien living as a human on earth - loves doing his job but was concerned with the amount of time he had to shoot the film.

He told BANG Showbiz: "I dreaded the quick turn-around. I love to tinker and play with the film in post. There was just too little time. I am blessed to be a director. There is nothing about it that I dread.

"All films present tremendous challenges. IAM4 was loaded with special effects and the number of shots grew. We had less than nine months to finish the film. So it was a full court press to make our release date."

Discussing the possible follow-up to the film - which screenwriter Marti Noxon recently said had been "shelved", D.J. revealed he would love to do a follow-up because of the strength of the character Number Six, played by Australian actress Teresa Palmer.

He added: "Of course I would be interested. I think Number Six would be a great character to take the next level."

'I Am Number Four' is released on Blu-ray and DVD on June 20.