The sixth movie will be split into two separate films, bringing the running total to seven.
"With the success of this last one, and the inclusion of so many characters, and the broadening of scope, when we were sitting down to figure out what would fit into the real estate of number six, we didn't have enough space," the Fast and Furious star and producer told The Hollywood Reporter.
"We have to pay off this story, we have to service all of these character relationships, and when we started mapping all that out it just went beyond 110 pages. The studio said, 'You can't fit all that story in one damn movie!'"
Fast & Furious 5 saw the franchise move from the racing to action-adventure heist genre.
The closing scene of the film teased the return of Eva Mendes and Michelle Rodriguez to the franchise.
Universal Pictures had been said to be considering filming the sixth and seventh sequels back-to-back.
Watch the trailer for Fast & Furious 5 below: