By Matt Hardy The chief executive of Saudi Pro League club Al Hilal has insisted the Club World Cup remains the most important competition in club football despite issues surrounding player wellbeing. Esteve Calzada added that playing European clubs is the real benefit from winning the Asian Champions League, something Al Hilal have done on four occasions. “For us [the Club World Cup] is extremely important,” Calzada said at the Leaders sport business conference in London. “I recognise that there’s a lot of debate around it now but for us it is probably the single most important competition of…