What if Havertz scores on his return back to Stamford Bridge. It will be a big headline. Arsenal has had a very good defence with Saliba, but they may have to play without him against Chelsea. The last season where Arsenal lost Saliba, they became vulnerable in defence. I am sure that Arsenal coach has a plan to make sure that do not put them at a disadvantage as he did have a replacement for Saka in their game against Manchester city.