Francis Coquelin is preparing to play as a center back due to a number of injuries, including Per Mertesacker.
Gabriel and Laurent Koscielny were left behind as Arsenal traveled to the United States for two preseason fixtures.
This sounds to me that arsenal is just a cheap club, they should be signing another defender instead of turning coquelin into a defender. They use the same thing that manchester united used before, turning daley blind into a defender and that totally ruined his performance for the whole season