Real Madrid are really very upset about Vinicius' injury. So far there have been no signs on the part of Real Madrid to sign a player to fill the place left by the Brazilian. Ancelotti will probably work out several alternatives to cover the hole, it is possible that Don Carlo will change his scheme and rotate the player's position but if this is done then of course there will be consequences, especially regarding Jude Bellingham's position which is also likely to change. At the moment there are only a few alternatives that Ancelotti might do, maybe Valverde will try to play as a winger or he could just play the Brahim Diaz-Joselu-Rodrygo trio. But I'm sure Ancelotti is preparing the plan very carefully and he probably doesn't want Bellingham's position to be shifted and he will still put Bellingham as a false nine.
Injury is something that cannot be predicted and is not wanted, of course, what Vinicius has experienced will certainly make the Real Madrid team very disadvantaged because now Vinicius has become Real Madrid's mainstay on the front lines.
This made the situation even worse after they failed to get a new striker and the Mbappe drama that never ended made Real Madrid's front line really very weak right now.
Vinicius is expected to be out for 6 weeks, and this will make Real Madrid start the early UCL matches without his mainstay player. Of course, this will make it more difficult for this team, but on the other hand, I don't see any strong rumors that Real Madrid will sign another player.