#1 Kostas Manolas
A familiar name, Kostas Manolas has been heavily linked with a Premier League move in previous transfer windows - this summer could be the perfect time.
Having made more than 150 appearances for Serie A side Roma, the Greece international continues to rack up valuable experience and would be a welcome addition to Arsenal's backline as they look to strengthen.
It's likely that the 24-year-old would work well alongside the likes of Shkodran Mustafi, Calum Chambers and Rob Holding if a deal were to be concluded.
Possessing a few similar attributes to Koscielny, Manolas is quick enough to chase quicker attackers and has good upper body strength, welcoming physical challenges. Crucially, he rarely suffers from lapses in concentration which is an important but under-rated asset to have, especially in top-flight football where things can intensify at a moment's notice.
Manolas' presence could help improve the side's awareness at the back, while reducing the number of goals they concede in the process.