Arsene Wenger plans to ask Alexis Sanchez why he took Arsenal's penalty against Hull City on Saturday even though Santi Cazorla was the designated spot-kick taker.
Sanchez missed from the spot late in the first half but still finished with two goals in Arsenal's 4-1 victory at the KCOM Stadium, the Gunners' third straight league win. Cazorla had taken Arsenal's last two penalties -- and scored both -- but it was the Chile forward who stepped up on Saturday, only to see his low effort saved by Eldin Jakupovic.
"It was Santi Cazorla to take it, I don't know why it didn't happen," Wenger told the BBC. "Did Santi not want to take it, or did Sanchez take the ball? We have a pecking order, but on the pitch they have to want to take it. But he was not planned, Sanchez."
Wenger added that he intends to talk to the players to sort out the situation.
"I want always to know what happened," he said. "And [for it] to not happen again, we have to see why that happened. But overall, anybody can miss a penalty. You have to accept that. It happens to all of us ... and it's happened to Santi Cazorla as well."
Overall it was a convincing victory against a 10-man Hull side and Wenger was happy to see Granit Xhaka wrap up the scoring with a long-distance effort.
"I'm very happy for him," Wenger said. "When you come to a new club and there's a lot of competition going on, you look for confidence and to show you're a good player and to score goals of course helps for your confidence. And he has that in him, he has that in the locker, shots from a distance. Left-footed players, usually they have that."
Alex Iwobi also impressed for Arsenal and set up the team's first two goals. His shot was first deflected in by Sanchez to give the Gunners the lead, and he then played a one-two with Walcott for the second, feeding the forward with a delightful backheel pass.
Iwobi was injured in the season-opening loss to Liverpool but has three assists in his two league starts so far, indicating that he's ready to build on the breakthrough he had in the spring.
"Well, look, I started him last year because I've seen that there's something in him that is quality of vision, quality of give and go, his movement," Wenger said in his news conference. "He can break the lines with a pass and individually as well, so there's a lot in the locker.
"Overall, he's only 20 years old so you could see that he has gained in confidence now. He can take people on much more and he has gained power as well. It's interesting what he has done."
Wenger said he was impressed by the way Arsenal ended a tough week following their Champions League draw at Paris Saint-Germain.
"I think overall we had a convincing performance in two different situations," Wenger said. "Eleven against 11, I thought we played well. When you play 11 against 10, it is of course not the same mentally and psychologically.
"But we remained serious and in the end we won the game in a convincing way, I would say, overall.
"But we had a very difficult game against Southampton last week, went away to Paris Saint-Germain. We go away again so you are happy with the three points."