This is certainly to be expected as Real Madrid are in a difficult situation at the moment but collecting 3 points against Celta Vigo will not be too difficult for them. Moreover, the current playing XI is also strong and professional players, they must perform well to win. However, if the eleven can play like you said, then Real Madrid can expect 3 points and their gap with Barcelona's points will be less. Moreover, I think Ancelotti must take good strategy and not miss this opportunity against Celta Vigo but they must collect three points. If Vini jr. plays and attends the match against Celta Vigo then we are more optimistic that Real Madrid will be guaranteed victory.
Celta concedes a lot and Real in such a tournament position cannot afford to lose points, they must win and wait for Barcelona to make a mistake. In the match with Celta, I think that Ancelotti will focus on attack, so I expect Real to win for odds 1.7, this will be a good bet. I also expect Real to score at least two goals, but since this will be a game a few days before the match with Dortmund, Ancelotti will also think about the players not getting too tired in this match with Sevilla, so 0:2 or 1:2 is my prediction for this match.