A protective cover for covering an inflatable ball body includes: a flexible surrounding wall capable of forming a receiving space that is substantially ball-shaped and that is adapted to receive a ball, the surrounding wall having inner and outer surfaces, the inner surface being adapted to contact intimately an external surface of the ball when the ball is in an inflated operative state, the surrounding wall having at least one first opening extending through the inner and outer surfaces, the first opening having a size sufficient for access of the ball when the ball is deflated.