Zinedine Zidane has a lot of players. He doesn't want to overplay anyone, so he usually rotates.
Valverde is one of the players that Zidane has been introducing in several games. He has also left him out on some occasions.
And as 'Mundo Deportivo' points out, life is very different for Real Madrid with and without Fede Valverde. The stats show that without him in the starting XI, Real Madrid have fallen on 2 of the 9 times this has happened. On the other hand, with Valverde starting, they have won 4 from 5. They have never lost.
So far this season, Fede Valverde has started 5 matches. 4 of them ended in a Madrid win, with the other a draw.
When Valverde isn't playing, you can tell. In the 9 matches he hasn't started, Madrid have lost 2 and won 2. The rest were draws.
The last game? Against Betis. Fede Valverde didn't play and Madrid drew 0-0. Coincidence or not, the figures say no, when he plays, Madrid win more.