Arsenal have lacked even more is the quality in depth that the substitutes playing for a club with a stature of the North London side should possess. Or simply, have lacked any depth at all.
After losing Bacary Sagna to Manchester City, Wenger got extremely lucky when Hector Bellerin more than just stepped up to the occasion. In fact, he went on to make the spot his. The former manager decided to bring in a Mattieu Debuchy to provide cover for the Spaniard but his association with long-term injuries did little to help the cause.
In Stephan Lichsteiner Arsenal finally, have a defender who not only is decidedly top quality but also possesses the astute defensive mind of an old-fashioned defender.