article_snippet: likewise Francis Coquelin, who played on after breaking Wenger nose.
article_snippet: Vice-captain Mertesacker and Danny Welbeck were axed and replaced by Gabriel and Alex Oxlade-Chamberlain.
article_snippet: Per Mertesacker (right) was demoted to the bench following Arsenal's Champions League loss to Monaco .
article_snippet: Mertesacker's role in the starting XI has been called into huge question this season following a string of below-par displays, including against Monaco.
article_snippet: Mertesacker knows that more than most.
article_snippet: Francis Coquelin was forced off after initially clashing heads with a team-mate before being hit in the face .
article_snippet: It was even more uncomfortable for Coquelin (below), who was left with a broken nose following an accidental collision with Giroud.