Emery is considering a late bid for AC Milan's Ricardo Rodriguez in an attempt to solve his problematic left back situation.
Sead Kolasinac is out with a knee injury, while Nacho Monreal has yet to make an appearance for the side during pre-seaon.
Monreal has also been injured, and is unlikely to be available for Sunday's Premier League kick-off against Manchester City.
20-year-old Ainsley Maitland-Niles looks the most likely to step into the position against a strong City side.
Rodriguez joined Milan last summer following five years in the Bundesliga with Wolfsburg, and make a great impression.
Milan are not too keen on the idea of selling the 25-year-old Switzerland international, and are asking for more than £30m for his exit.