DC: Laurent Koscielny/Gabriel
The French centre-back is likely to remain a fixture in the Arsenal defence this season, but Brazilian Gabriel looks a fine squad player ready to come in when needed.
DC: Per Mertesacker/Calum Chambers
Per Mertesacker is surely first choice to partner Koscielny in defence this season, but impressive England youngster Calum Chambers is sure to be one for the future and should get some games this term.