The filmmaker - who has directed all four of the previous instalments in the franchise - does know many people did not enjoy the last movie 'Indiana Jones and the Kingdom of the Crystal Skull', but would not work on further films just so he could win them round.
"I think audiences think we're two for two. They love 'Raiders'. They love 'Last Crusade'. They don't love as much 'Temple of Doom' or 'Crystal Skull'.
Harrison Ford, who has played the titular whip-cracking character in all the previous movies, has previously claimed he would like to have another go at making a decent follow-up.
He said: "I wouldn't mind another shot at Indiana Jones. I still think we have a chance of making a really good one."