if you have 0 understanding of english it means you grew up with no english culture influences
with how globalism works the only way this happens is if you were held locked in a basement your entire childhood or your country is backwards enough to not have any
"A little bit" is not good enough. In tense situations he will most likely not speak well enough english and thus making his callouts near useless. I don't know how well he speaks english though but if it's one of his weaknesses than it's a valid argument against him joining such a team.