I think Vini injury is not too bad because Ancelotti has confirmed it.
How did he confirm that, I don't think the full check was as complete as Marca reported. But I haven't received the latest news about Vinicius' injury status, even on Real Madrid's official website there is no news about 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.
Of course it is true that Vinicius has been a very important player in the Real Madrid squad in recent seasons. Vinicius has had a bigger role in Real Madrid's attack this season after Benzema's exit, but unfortunately he is starting to earn himself injuries. Many people hope the injury is not serious, but at least this time Ancelotti really feels a lot of hard work that will be faced without Vinicius.
From a technical point of view, of course Ancelotti had to make some changes. Joselu did not make an impact on Real Madrid's attack scheme so that he was not a mainstay to think about in the future. I tend to agree if Rodrygo and Bellingham are played together in a 4-4-2 formation, or maybe keep using 4-3-1-2 where Bellingham is still an attacking midfielder while Valverdre/ Joselu and Rodrygo lead the attack.