It's ironic that in a dispute over correct writing, you've split your infinitive. "Properly to play" or "to play properly" are correct English grammar.
'Merica.
- https://www.businessinsider.com/football-vs-soccer-map-2013-...
- https://www.businessinsider.com/why-americans-call-it-soccer...
Countries that are new to football calling it "soccer" are like countries new to hockey calling it "ice-golf": there are other ways to be unique and draw attention.
To someone who always called it football, the word "soccer" feels like a needless neologism.
I guess your culture says nothing strangely eh?
Because A), in 99% of cases it is only the US that does shit weirdly, and above all, B) because in 99% of those cases, Americans are so fucking ultra-annoying in assuming their parochial way is The Gold Standard.
HTH!