The 23-year-old rejected Chelsea because he did not want to be sat on the bench at Stamford Bridge.
Bettinelli signed a new four-year contract at Fulham on Saturday. The goalkeeper admitted he was flattered by interest from the Blues.
“There was always that speculation with Chelsea, but I did not want to be sat on the bench,” said Bettinelli, according to the London Evening Standard.
“It was lovely to be linked with Chelsea, one of the biggest clubs in the world, but this (Fulham) was always the place for me.”