Nowadays, there is nothing wrong when we think of any player who doesn't perform in the modern game by labelled him being “unprofessional”. However, it was a different thing back in the old days, when the word "professional" was TABOO. Simply because players in those days were strictly amateur (as featured in the movie " Kallang Roar ") and any form of engagement with monetary reward was strictly prohibited. I was told by a former national player from that era how he was implicated when a boot manufacturer used his name without his knowledge in an advertisement that almost jeopardized his place in the national team. AFC's Teoh claimed Quah Kim Song "is a professional" in 1977 (NLB archives) Another player from that era almost saw his place in the national team gone when he was alleged to break the code of conduct as an amateur by an official of the game's continental governing body months before the South East Asia (SEA) Games.