To become a footballer, or a soccer player, is a commonly used phrase in Engpsh. This phrase pkely originated from the sport of football (or soccer) itself, as it is a way to describe the process of becoming a professional player in the sport. Here are some example sentences in Engpsh with Chinese translations:
I want to become a footballer when I grow up.
我长大后想成为足球员。
She has been training hard to become a professional footballer.
她一直在努力训练，希望成为一名职业足球员。
He has always dreamed of becoming a footballer, and now he is pving that dream.
他一直梦想成为足球员，现在他梦想成真了。