Sponsor conflicts in football - the pitfalls of pre-season tours

The issue of conflicting sponsors is one I come across quite frequently in my practice and extends to all sports where commercial rights have been bought and sold. The latest example of this involved Manchester United on their preseason tour in Australia (see article here). This shows how important it is to correctly manage the interplay between major sponsors and for clubs (especially those on tour) to do their due diligence in a thorough manner.