Just out of general interest, why are you so certain that, were an English Referee to receive that appointment, it would definitely be Mr Oliver?
Mr Collina will, I feel certain, appoint the most appropriate officials to any and all remaining games.
An Italian partner of a former colleague of mine, suggests from media articles in Iraly that he is not as 'swayed' by VAR interventions as we are in England, particularly if it's in any way a debatable call.
His priority is, allowing for the above caveat, how the game has been managed