No idea. At the Igora exhibition, the first showcase of his SP in July, the lady who recorded the video said on FSO that Mishin explained that Sasha had an injury and would not be jumping. So he did the SP run-through without jumps. After that Sasha posted two pics of a government medical centre in St Petersburg and geotagged himself there.
Edit:
He did attend both summer camps a few weeks later though, so it probably wasn't too serious. But at the first camp in Erzurum Turkey, he had altitude sickness.
Okay, not very serious if he pretty much skated the whole time.
(I mean every injury does affect the performance and everything but this is coming from a peson who has had two stress fractures on the lower back before)
