Arsenal boss Arsene Wenger has warned Champions League opponents Borussia Dortmund that his side's confidence has returned.

GettyImagesArsene Wenger was relieved to see his side edge past Swansea

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Arsenal earned their first Premier League win of the season as they defeated Swansea 1-0 on Saturday, helping to lift the mood at the club following their recent 8-2 loss at Manchester United.

Wenger next takes his team to Dortmund on Tuesday for his side's opening game in Champions League Group F and he believes the Gunners will demonstrate they are on an upward curve.

He said: "The confidence is back now. [We] had not won yet in the league and that had played a big part in our head. In our job, momentum is vital. We just want to play to win.

"When you look back when we travelled to Udinese [for the Champions League play-off] everyone expected us to win the game and we did, we want the same against Dortmund."

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