Trent's only likely to miss 1 League game, Szobo is already back training and won't miss a League game. Pep Ljinders confirmed Robertson and Kostas should be back towards the end of this month (1, maybe 2 League games). Heck, Thiago and Bajcetic may even appear sometime soon(ish) too.I suppose it depends on how many prem games the likes of Salah, Szobo and Endo miss, but more injuries when your top scorer and assister is out, isn't ideal.
Endo will probably miss a few games but thankfully Mac Allister is back now. Salah's a bit of an unknown but assuming Egypt get out of their group, they're likely to have a very tough first knockout game which if they lose, he'd only miss the Bournemouth League game.