Alexis Sanchez says he still has to improve despite an impressive start to his Arsenal career, while he believes the Gunners have the "quality stars" needed to challenge for the Premier League title.

The form of Alexis, 25, signed from Barcelona in the summer for 32 million pounds, has been one of the few positives in an otherwise inconsistent opening to the season by Arsene Wenger's side.

The Chile international scored his 12th goal for the club at Swansea on Sunday, when Arsenal again failed to hold onto a lead and were beaten 2-1, having previously thrown away a 3-0 advantage in the Champions League tie against Anderlecht to draw 3-3.

Alexis, though, remains upbeat over the decision to leave Spain for England, and believes the Gunners -- who are currently 12 points off league leaders Chelsea -- can still have a successful season.

"Now that I am here, sometimes I stop to look at my teammates during the training session and I realise that I am surrounded by a lot of quality stars,'' he told Chile AS. "I have been impressed by their attitude and their talent. I love how they create spaces, their individual and collective movements.

Alexis Sanchez has made an impressive start to life at Arsenal. Julian Finney/Getty Images

"I tell you seriously: I like what I see so much that I have repeated myself many times, that if we have the required winning mentality, if we are positive and try to win every single game, I know we can win any competition. I know that with this team we can win many trophies in the coming years. I am convinced. I hope to win everything here. That's why I came.''

While Alexis concedes the Premier League is "the most complicated football and not easy,'' he insists he "likes the challenge."

And despite seemingly needing little time to adapt to English football, the forward still feels there is room for plenty of improvement in his game.

"Little by little I am gaining confidence in my teammates and am gradually learning more,'' he said. "At first I had trouble understanding them, knowing where they ran, their movements, what gestures meant what, but every time I feel more confident.

"I am starting to memorise the moves of my teammates and I learn to help them. Clearly I need to improve and that is what I say in the dressing room, that I could stay a little less with the ball, play one touch play more often to facilitate counter-attacks -- that is vital. I must learn that because the rapid transitions are key in this league and with this team.''