Arteta, however, is convinced the best is yet to come for Willian and he will get even better once fully integrated into the team.
“I think he started really well with his first game against Fulham and then we’ve been changing the front-three,” he said.
“He had an injury and he didn’t have any time to train, he didn’t have any pre-season, he was later than the others.
“They need to generate that cohesion, that understanding and those relationships on the pitch between the front players, the wide players in order for things to work better.
“I can see a development in the last two games and the understanding of things that we do but he’s not used to. He’s getting better and better and we all know the quality that he has and he’s a great option to have on the pitch.
“He’s a player who can make a difference, he’s got the ability to find that last action to open the door when everything is really tight.
“To score a goal, create an assist and the personality and understanding that he has on the pitch to manage the game we need in certain moments. At Old Trafford [on Sunday], I think he did that really well.”
“It is a really competitive side,” said Arteta.
“They have played some very different matches with different approaches to certain matches, having some big results against big teams and after two defeats they need a win as well and they will show that right from the start I think.
“We know the game we are facing against [Villa], we have lost the last two times against them so it will be difficult, they are a team that has grown so much in recent months and they made some clever business in the market and they are stronger than last year.”
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