Would that not be for the new manager to decide ?
I think every player starts with a clean slate when a new manager comes in.
I would guess that Moise Kean was happy to see leave and Ancelotti arrive, I think Gylfi Sigurdsson may be nervous that a new manager might not have the faith in him that the old manager seemed to have.
Michael Keane was good last season but very poor this season, I think our midfield for different reasons just has not been good this season and that impacts on our defence.
I am not sure there is a single defender who has had a good season so far this year.