Am certain they will win the match. Ancellotti will not want to lose any game right now. At least not to Celta Vigo. The odds are favoring to Real Madrid by the bookmakers. No doubt if they play. Going back to their previous H2H. Celta Vigo has only been lucky to have won 7 matches and gained 5 draw. While Real Madrid has won 30 matches directly. I also noticed that both teams are good in scoring an average of 3.5 goals when they meet. This will make it easy for those who wish to bet on this game to confidently bet on the odds that they would win.
Right now its Real Madrid to win and Over 2.5 goals.
Although I also hope Madrid wins, I understand Madrid current condition is missing several important players who are likely to be absent for the long term. On the one hand, for example, it will end in a draw against Celta, I will also understand it because Ancelotti prefers to maintain the physical condition of the main players to face the UCL match later.
I agree with you if the over 2.5 option is the best choice with odds @1.65. But I might choose a bigger risk to get odds around @2 on over 3.