West Bromwich Albion defender Jonas Olsson was disappointed with Santi Cazorla's efforts in winning Arsenal's opening penalty on Saturday.

The Spain international is expected to dodge any formal punishment.

"I think it's a wrong decision but that said I think referees have a difficult job," said defender Olsson.

"They have to make the decision in a split second. If it's a dive, the focus should be on the person diving as well.

"You can blame the player. It's a wrong decision."