Arsenal boss Arsene Wenger explained substituting Alexis Sanchez during defeat to West Brom.

Wenger insisted Alexis had collected an ankle injury.

He said: "He was injured from the tackle in the first half. It was a bad tackle.

"His ankle is in an absolutely terrible state. He should not have played in the second half but he insisted that he wanted to come out. In the first half he was the one who created many chances, made dangerous situations and in the second half you could see that he couldn't anymore. In the end we had to take him off. He should not even have played in the second half."