The clubs legal responsibility for the behavior of supporters is used by UEFA to influence  the  content  of sports competitions, ideally abstracted from demonstrating by spectators any non-football ideas. Nevertheless, the regulation of the national associations-members of UEFA also assumes the responsibility  of the clubs and, sometimes, the supporters themselves for the unacceptable behavior of the latter. The  experience of regulation this issue by the Austrian Football Association demonstrates mentioned approach. Therefore, it is interesting to make a comparison: how much the regulated responsibility of supporters affects to the regulation by the association a strict liability of clubs for the behavior of fans. Using the practice of CAS, we may see a presumptive approach on the basis of an assessment of the situation by “a reasonable and objective observer” for the objective resolution of a dispute.