England goalkeeper Paul Robinson has criticised the unpredictable nature of the new World Cup match ball.
The Tottenham stopper, 26, has been practising with the lighter ball in England training ahead of Saturday's Group B opener against Paraguay.
And he warns the balls will give strikers the upper hand in Germany as they are "very goalkeeper unfriendly".
Robinson said: "It's more like a water-polo or volleyball. It's very light and moves so much in the air."
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