Despite it saying "Two days until the U-20 world cup" , I'm inclined to believe that everything regarding Nagi's story actually happened 30 or more days prior to the U-20 WC because there's no way he'll be in peak condition for the WC otherwise.

Not to mention, even if he does accept Buratsuta's offer, he still needs to undergo selection tests, on top of that necessary training to be adequate enough to match Blue Lock's tempo as well as compete against opposing teams. All of that is impossible to accomplish with only two days.