Martinez has been suffering from a back problem but is still set to play Sunday against West Ham, according to manager Unai Emery, per John Townley of Birmingham Mail. "He has a problem in his back. He is not feeling 100% well. Tomorrow and Saturday, we will check him again. Hopefully, he is getting better for Sunday. He had a back problem last week, and he was not feeling 100% well. We decided to stop him for this match. Hopefully, he can feel better for Sunday. It is not a big problem. Last week in Brighton, he felt it."