Abstract: The invention relates to a system of devices that can be integrated into elements that are designed to assist the referee in football, such as the referee's whistle, the linesmen's flags, the playing area and the ball. The inventive system can also be used for American football and for any other ball sports. The invention makes use of a series of sensor elements, LEDs (light-emitting diodes) or indicator bulbs, vibration indicators, a control console, a laser light and radiofrequency signal transmitter/receiver mechanisms together with the respective microchips thereof, all of which are known in electronics. The aforementioned elements are adapted and used as auxiliary refereeing supports in the standard elements, i.e. the whistle, flags and rectangular playing area, and, in this way, can be used to provide instant correct solutions to playing situations that could give rise to dubious decisions and subsequent disputes.