Luiz featured in their Capital One Cup win over Swindon Town.
"We don't have to prove anything. We just have to show we want to play. Everyone had an opportunity to play against Swindon and show our football.
"Last year you could talk about seven players being on the bench and the next year is the same. Mourinho chooses his 11 players to play, his philosophy and tries to do the best job for Chelsea. That for me is normal.
"Of course, it was good to beat Swindon. It's a cup competition, we are a big club and we want to win this as well. It was good for me and the team."