I think it's fair to say that not too many of the massed ranks of Gooners inside the stadium were expecting to see the young Spaniard deliver in such a major way either, but deliver he did.
Wenger said after the game:
"It is a sign of a good player to do something special when you don't expect it. His first goal was a real lift for him and you could see a different player straight away. However, I preferred his second goal because it was the outcome of our quality team play, a magnificent pass from Vieira and a great finish.
"His workrate was outstanding, he gave everything and the number of runs he made was fantastic. He has been here only three weeks and there is a lot more to come from him.
"The boy is 20, he has just arrived from Sevilla, he doesn't speak the language and he has played three games, so there is an adaptation needed.
"The younger you take them the more chance they have to adapt quickly. He is already very popular and feels more comfortable in the team after the last few days.
"It is not easy when you don't speak the language and you have to integrate into a team of so many talented players, but you can see there is talent there.