Looking at the way Burnley play, their style suits high crosses and they have some great aerial challengers like Wood and Tarkowski. For that reason, I would like to see Ancelotti instruct the defence to play a high line and ask Pickford to step forward more as a 'sweeper keeper'.
Burnley are very good at pushing defences back with long, direct passes over the top, and a high defensive line can be tough to hold under such pressure. In that sense, it may be better to drop and make the game a real physical battle, which is maybe want Burnley want. If so, Olsen would be the better choice as he is much taller than Pickford and has a better command of his area.
It will be interesting to see how Ancelotti lines up.