Since coming into the team in 2017, he hasn't played a single minute in midfield. Why would we throw him in at the Bernabeu?
He may not start on a sheet of paper in midfield, his role however takes him into those spaces to impact the game on the ball.
He also has spent many many years in the youth teams being taught and playing specifically on the team sheet in midfield.
I'd have used today as an opportunity to explore playing Trent in midfield, he has so much quality on the ball - it's perfectly reasonable to believe he can impact the game from that position on the pitch. His range and ability of passing could quite conceivably translate into a playing making role in that space.
It would also help answer the question and put to bed whether he would be capable or not too.
In a game which we're not expected to win by most, a game where playing Gomez at right back who would almost certainly be more suited to protecting Vinicius in that space. A game where we have bugger all midfielders to choose from.
I'd have given it a go.