Alexis Sanchez
Alexis Sanchez has scored 12 since his summer arrival from Barcelona.Getty Images

Arsenal boss Arsene Wenger has claimed that even though Alexis Sanchez scored once again with a goal against Swansea he was far from his best.

The Arsenal player of the month of October netted the opener for the Gunners after finishing an excellent run and pass from Danny Welbeck to score his sixth goal from the last four Premier League games – and his 12th since his £32m summer move from Barcelona.

However after Swansea managed to come from behind with two late goals by Gylfi Sigurdsson and Bafetimbi Gomis to secure the victory, the Arsenal manager was so unhappy that he even questioned Sanchez's performance.

"He (Sanchez) scored but I think he didn't have the best game today," Wenger said, according to Arsenal's official website.

After blowing a 3-0 lead against Anderlecht in the Champions League's midweek game, the Gunners threw away an advantage against the Wales side, which left Wenger's side 12 points behind leader Chelsea in sixth place.

"It's unfortunate to lose a game like that but we were not rigorous until the end. We produced quite a decent performance for 75 minutes but you have to last 90 minutes.

"Did Tuesday night play a part in our mind? I don't think so, I hope not. You have to give Swansea credit, they did not give up, they did fight until the end."

Now just after eleven Premier League games, Wenger has conceded Chelsea are the main favourites to clinch the title.

"At the moment Chelsea turns around an average of 100 points per season. If you look at the number of points they have today, if they keep that up nobody will touch them and that's for sure. It doesn't look like there's anybody capable of challenging them at the moment.

"There's no obvious reason. They had a good start and we have gone through that too. As long as we don't lose, you don't question yourself. There's a little bit of extra spirit in the team that gets them through when it's tight."