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For now, Vinicius is still in recovery condition although he could appear when Real Madrid faces Celta Vigo because the recovery deadline for Vinicius is only two days from now. But there will also be a possibility for Ancelotti to play Arda Guler and Endrick in the match because both are still quite fit and several other players also still need rest for other more important matches. I also have no doubts about Real Madrid's ability to get three points at Celta Vigo's home ground because it is true as you said that Real Madrid need to keep the points gap close to Barcelona at times like this.
Ancelotti may not force Vinicius to appear in the away match against Celta Vigo, but if he is fit and ready to play, then Ancelotti will give him minutes even if he doesn't play full time. Real Madrid has another tough match after the match against Celta Vigo, it is the Champions League match against Dortmund.
Apart from Vinicius, Real Madrid can also expect their main goalkeeper to recover before the match against Celta Vigo. Thibaut Courtois and Andriy Lunin are expected to recover from 16 to 18 October, perhaps the same as Éder Militão. Real Madrid is finally ready to face any opponent even though they are being hit by a storm of injuries. There is certainly hope of winning the match against Celta Vigo, Madrid even has a high probability of winning.