Hollywood legend Ford, 64, snubbed director George Lucas' big bucks offer in favour of playing heroic archaeologist Indiana Jones again.
However, Lucas wasn't too disappointed with Ford's decision as he was already developing an idea for a fourth Indiana Jones movie with Steven Spielberg.
A source told Britain's Daily Star newspaper: "George wanted Harrison to play Indy but cleverly sounded him out about playing Hans Solo instead.
"Harrison was horrified. After that he was delighted to be playing Indy again. He told George he just couldn't face being stuck in a spaceship with Chewbacca again." Ford will still receive £20 million for donning his famous fedora hat once again and embarking on a final adventure as the whip-cracking character.
Ford and Lucas announced that they were making a fourth 'Indiana Jones' film earlier this month.
The movie, which Lucas will produce and Spielberg will direct, is due to be released in 2008, 19 years after Ford last appeared as thrill-seeking Indy in 'Indiana Jones and the Last Crusade'.