It's true that Vinicius Jr. is injured, but there has been no official statement on how severe their flagship Wenger's injury has been. I think he will miss one or two games in the future, automatically Madrid condition today is lacking players on the front lines. this was a moment for Joselu to show his quality while Vinicius was injured. In the match against Celta Vigo, Madrid actually won with more than one goal, the most unlucky was when Rodrygo failed to execute the penalty.
It is true that another fact shows that Madrid has difficulty scoring goals, but I think Celta has a pretty good defense. After the game, Ancelotti himself admitted this when he gave his comments.
Actually Vinicius Junior got injury on last match against Celta Vigo, he must replaced on the early minutes with Joselu after getting injury although Real Madrid not announced yet what happen with Vinicius Junior. Losing Vinicius Jr make Real Madrid less option on left winger, although possibility moving Rodrygo but Madrid still get difficult on attacking line position after Karim Benzema departure. Carlo Ancelotti have withdrew his statement with Madrid current transfer activities have been over before window transfer close left few days later. Real Madrid must signing new winger if Vinicius Jr got serious injury, but if available come back without long time is not necessary for Madrid signing new players and waiting for Vinicius Jr recovering from injury.
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.