Mustafi discussed the situation in a column with arsenal.com.
He said, "This season I've been playing mainly in the Europa League and the cup competitions, so I've focused just on doing my job and trying to produce things that the coaching staff ask for me to do on the pitch to show that I'm ready for the team. No matter what's going on, I've just been trying to work and become the player that I was before - and better.
"I focused myself really and I've put everything in every day on the training pitch. When I go home, I want to be able to say to my family, 'I gave everything at training today and I'm ready for whichever game is coming up. I'm ready to put 100 per cent in'. That was the main thing for me. I just wanted to focus on not making errors, on staying concentrated for 90 minutes and get all the confidence back that I had when I arrived here."