Carl Jenkinson v Andre Ayew
A low-key signing from Charlton in the summer, injuries at the back have forced Arsene Wenger to promote Jenkinson a little earlier than he might have liked. Stepping in for Bacary Sagna at right-back, he has shown genuine promise but also a tendency to drift. In Seclin-born forward Ayew, Marseille have a player more than capable of exposing any such weakness. Pacy and with a good scoring record, OM may choose to test Jenkinson by filtering play through Ayew.