BANGKOK, (Reuters) – FIFA president Sepp Blatter  has urged fair play in campaigning and voting ahead of next  month’s Asian Football Confederation (AFC) Congress amid a  power struggle in the Asian game. 
With AFC chief Mohamed Bin Hammam taking on Bahraini Salman  bin Ebrahim al-Khalifa — his first-ever electoral challenge —  for his FIFA executive committee seat, Blatter called for both  candidates to follow the rules.  
In a statement, he said soccer was based on “fundamental  principles of discipline and respect for opponents and the laws  of the game” and urged candidates to “follow values of fair  play and ethics”. 
 Both candidates have attacked each other via the media,  with al-Khalifa accusing Bin Hammam of mismanaging Asian soccer  and the AFC president claiming his opponent is a stooge for  well-heeled rivals keen to oust him.