article_snippet: In other words, it shouldn't take a tactical genius to work out how to beat they.
article_snippet: Damage done in the first leg, and Per Mertesacker said their mentality wasn't right.
article_snippet: Therefore Per Mertesacker has to take the blame for sending Per Mertesacker players out with the wrong mentality.
article_snippet: Last season, Mertesacker said Arsenalgave 10 per cent less mentally' when they were beaten by Napoli to miss out on top spot in the group.
article_snippet: Per Mertesacker admitted Arsenal's mentality wasn't right as Arsenal failed to reach the quarter-finals .