Per warning for Gunners

German stopper says Dortmund will be tough opponents

Mertesacker: Warns Arsenal about Dortmund threat

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Per Mertesacker has warned Arsenal that they face a tough examination of their European hopes when they travel to Borussia Dortmund.

The Gunners open their UEFA Champions League campaign with a trip to the German champions on Tuesday.

And former Werder Bremen ace Mertesacker warns that they could not have faced a tougher opener than against Dortmund.

"Dortmund were the best team in Germany last year, they do a good job passing the ball and have great players," said the German central defender.

"It will be difficult for us but I know we have very good players and I'm confident we can get a result.

"Dortmund are the toughest opponent in our group, so we will be very happy if we can take something from this match."

Mertesacker made his Arsenal debut in the 1-0 win over Swansea on Saturday, and he admits that despite his experience it is a test for him playing in the Premier League.

"I have a lot of experience but it is a new level for me to play in England although my targets and goals are high," he added.

"One thing is for sure, I will give everything every time I put on the Arsenal shirt."