The paper deals with the transformation of the professional sports club - association into a sports public limited company by implementing the provisions of the Law on Sports. The author analyzes the legal framework of the organization of sports clubs and looks at the autonomy and self-regulation of sports organizations. The restructuring process offered a lifeline to clubs in difficult financial circumstances. The Law on Sports prescribes the conditions for a obligatory transormation procedure, but also recognizes a voluntary transformation procedure. Changing the legal form gives clubs a healthy foundation and a more secure future for clubs that retain their identity. Through the process of transformation in the registration circles, the local self-government unit and members of the association, and then the public, are included as potential shareholders. Creditors of the professional club are given more options, they can turn their claims into roles in the company or wait for the completion of the transformation procedure and claim their claims in full from the sports public limited company. The new Law on Sports brings changes in the area of transformation, the Law on Sports no longer recognizes obligatory reformation. The lack of obligatory transformation provisions can be uncomfortable for some future clubs who find themselves in an unenviable situation. The paper deals with the comparison of the sports club - association and the sports public limited company as a legal arrangement of the sports club. The comparison refers to the establishment, membership rights and convenience of the association and the sports public limited company for the sports club. The paper establishes that the both forms have their advantages, but the sports public limited company has more advantages for the challenges of professional sports.