If Vinicius is sentenced to be sidelined for a long period of time it will make Ancelotti furious, losing the Brazilian winger would certainly mess up the situation in the Madrid camp because of the lack of options. But I think it is possible that Ancelotti will change the position of some of his players, for example bringing Valverde into that position and re-trusting the midfield to Modric-Kroos, or with some other experiments. However, if we return to hunt for additional players, I think it is still open, but it seems that there are no more quality stock players available on the market.
I think Vini injury is not too bad because Ancelotti has confirmed it. Indeed fans are quite worried because Vini is a pretty good mainstay on the front lines of Real Madrid so that when he was pulled out in that match many fans were worried about the injury that befell the Real Madrid winger.
In a situation like this, of course Ancelotti has to rethink a more precise tactical scheme when his winger is injured. However, Joselu seems to be a player that Ancelotti can count on for this position. Real Madrid will face Getafe in the upcoming match and I think Ancelotti is already thinking from now on to make wise rotations in order to maintain their chances of winning in every game they play.