比利时队的卢卡库替补出场，发挥了至关重要的作用。

Substitutes have made a big impact at the World Cup, and there could be more of them in four years' time.

替补球员在世界杯上起到了至关重要的作用，4年之后，可能会有更多替补球员有登场亮相的机会。

FIFA's coaching advisers will propose before the 2018 World Cup kicks off that teams can use a fourth substitute in extra time.

国际足联的教练顾问们将在2018年世界杯开赛之前提议，在世界杯的加时赛中可以派遣第4名替补上场。

Up to three replacements are currently allowed, even when knockout matches go to 30 extra minutes after scores are level in regulation time.

截至目前，比赛允许3名替补出场，淘汰赛阶段加上30分钟的加时赛也是如此。

It is said changing the rules could see fewer players struggle with muscle problems in high-intensity matches.

有人认为，规则上的改变有助于运动员在高强度的比赛中避免肌肉出现问题。

"It's a good idea. Only in extra time. Maybe if someone is injured, why not?" the former France coach said.

前法国主帅霍利尔表示：这是个好主意。只在加时赛实行。万一有人受伤了怎么办？为什么不呢？