FIFA insist ball has been fully tested...
"This is the worst ball that I have seen in my life," he said.
"It is terrible for the players.
"It is terrible for the keepers because it is impossible to follow the trajectory."
FIFA have defended the ball, insisting that it has been fully tested, but Capello feels that it is disrupting the flow of games.
"The big problem is that sometimes this ball is impossible to control," the former Real Madrid boss added.
"It is good when you play short passes but when you try to switch the ball with long passes it is very difficult to understand the trajectory."
Available since February, the Jabulani has been used in the Africa Cup of Nations, as well as a number of domestic leagues, including Germany and Argentina.
It was tested at Loughborough University but could not be used in England due to the Premier League’s contract with Nike.
The ball’s manufacturer, Adidas, has defended the way the ball moves, insisting that altitude is the reason for its movement in the air, and blamed players for not practicing with it enough before the tournament began.
A number of goalkeepers, including David James, Gianluigi Buffon and Iker Casillas, have been highly critical of the ball in the run up to the tournament.
"The ball is dreadful. It's horrible but it's horrible for everyone," said England’s David James, who also added that some keepers would end up "looking daft."
Robert Green and Algeria’s Fawzi Chaouchi have already suffered at the hands of the ball’s irregular movement, although it could be argued that their mistakes were down to individual errors.