According to Arsenal defender Per Mertesacker, Bayern from Munich got even stronger this season.
The Gunners will host the German champions in their home ground tomorrow. A victory is crucial for Arsene Wenger's pupils, as they lost their first two group stage matches.
Two years ago, the Bavarians eliminated the North London team in the tournament quarterfinals, and this year Pep Guardiola's pupils have strengthened with Douglas Costa and Arturo Vidal.
"Due to the two losses, this will be the biggest challenge we could face," - Mertesacker told Kicker.
"You hope that as the years go by, you get closer to them, but Bayern bring in new players like rabbits from a hat, which explains the difference in strength."
"At this moment, it makes them even harder to beat."
