He said, "The most important thing is what type of Celta we are going to present there, a team that is going to compete and try to win. And then, obviously, when you go to stadiums with very strong teams you depend on things not going well for them also, to have options.
"I want a strong and solid Celta and for Madrid to make mistakes so we can take advantage.
"Anyone who faces Real Madrid will say that they put one or the other, they will be very good. Obviously Bellingham is a great player and the one who is not on the field can be beneficial, but the one who is going to come out in his place will surely be a great player."
On Premier League rumours for Celta striker Strand Larsen, Benitez added: "I think he is quite focused, aware, motivated in terms of his performance. Everything we can talk about the future of any footballer will depend on his performance on the field.
"I hope that Larsen remains focused, looking for the rival goal, helping the team with his work and then the future will tell. If he scores a lot of goals and stays with us, I'm also delighted."