PlayStation 4 racer DriveClub may have been subject to another major delay, with Amazon US updating its product listing to feature a revised September 30 release date.

In addition, pre-order customers also claim to have received emails highlighting a new estimated arrival date of early October.

Sony has yet to confirm a further delay for DriveClub, which is still officially supposed to be on track for an "early 2014" release.

However, speculation that the game has seen a further delay has grown in recent days after Sony Worldwide Studios America development head Scott Rohde revealed that the game had been taken "back to the drawing board". has contacted SCEE for comment.