It was reported that he took a cleat to the back of the calf in the previous game, and blood clot eventually developed from there. He did not get it on the flight over. They aren’t exactly flying coach on these trips.
It seems part of the story is team medical staff originally diagnosed it (incorrectly) as a superficial clot, and then at some point he was admitted to the hospital where he was kept awake and given thinners, presumably being treated for DVT.
He then played in the London game, then afterwards was found to have clot spread to the lungs (could not have happened if just superficial clot). That led to him being ruled out for yesterday’s game. Then, things escalated really, really quickly. He went to IR yesterday (which would have only required missing 4 games) due to confirmation of multilple pulmonary emboli, then today was ruled out for the remainder of the season.