Last season Real Madrid had difficulty winning their home match against Real Sociedad. Real Madrid drew in the home match, while Real Madrid had to admit defeat when they visited Sociedad headquarters. Of course Real Madrid will try to improve at their meetings this season even if they are not strengthened by some of their pillars including Vinicius.
I believe Real Madrid is fundamentally not a worthy opponent for Real Sociedad considering the two's match record. In the last 36 meetings, Real Madrid was able to pack 23 wins, 6 draws and only 7 defeats. This means that it is highly probable that Real Madrid are the favorites at home despite their poor results last season against the same team.
I wish it will come true come true Sir Real Madrid can winning, because after all Real Madrid will be playing at home. They will get full support from their fans, so it will make their team fighting spirit to win and get three points. But Real Sociedad defense against a big team like Real Madrid is guaranteed to be very tight, I hope Ancelotti can find the right tactics in that match.