Good point earlier regarding Kova, exactly what I was going to post, though I understand we didn't see the same level of debut etc it's a similar enough situation. Saul is good friends with Kepa and should take stock from that situation, we actually now rely on Kepa, not to the amount we thought when paying the money we did, but ultimately he is a valuable member of the squad.
It's down to Saul to improve and as above let's see how things are going in Jan/Feb, not forgetting we do have others to take the fourth spot as well.