Might be in a minority, but I was not worried by Sheaf leaving as I think Eccles is a very capable player.
However, not getting a forward (like Boving) who can cover both wings well is going to hurt us till January I think. If EMC and Saka are injured at the same time we will have to change formation whether we want to or not. If Brau adapts to our game quickly we will be ok on the left long-term though when EMC is out.
I will be very pissed off if the wide forward issue is not addressed in January (more importantly I reckon Lampard will be seething).