Ghana and Wigan keeper Richard Kingson says the Jabulani ball is "unpredictable", reports the Manchester Evening News. Kingson expressed his concern despite keeping a clean sheet in the victory against Serbia.
"It is very difficult to handle," he said. "It is so unpredictable. When the ball is hit, you always have your sight on it.
"But the speed at which it moves and the directions it takes makes it tough for a goalkeeper.
"Even though I did not concede a goal, I am no exception to the rest. But we all have to get used to it now. Nothing can be done about it during this tournament."