The Gunners ended last season in disastrous fashion, missing out on the top-four and losing the Europa League final to Chelsea.
Arsenal conceded 51 Premier League goals last term, which is what arguably led to them missing out on the Champions League.
Emery is now rebuilding his backline and has seen two bids for Celtic left-back Kieran Tierney turned down.
Nacho Monreal will turn 34 next season, while wing-back Sead Kolasinac’s defensive frailties were regularly exposed last season.
So Arsenal will return for Tierney, 22, who Emery views as a signing for the present and the future.
The Scottish champions value their asset at around £25m, a sum which represents over half of Emery’s transfer budget.
But the Spaniard is prepared to sell players in order to fund swoops for other targets.
Error-prone Shkodran Mustafi and club captain Laurent Koscielny could both be in line for an exit.
Arsenal are looking to replace them with young centre-back William Saliba.
ESPNFC say that the Emirates outfit have won the race to sign the highly-rated St Etienne ace.
Spurs were tracking the French Under-19 star’s situation, but their North London rivals have beaten them to the punch, agreeing on a deal worth around £23m.
However, despite a deal being almost done, Saliba may be loaned back to Saint-Etienne for their next campaign.
But RMC in France reckons Arsenal could get the defender this month if they cough up another £9m.
But how would the Gunners line up if they did manage to land both Tierney and Saliba in the transfer window?
Starsport looks at the three potential line-ups that former Paris St-Germain boss Emery could utilise next term.