And to add to what Alan just posted, it is currently 1-1 at half time in Naples. If it stays like that until the end, Swansea will be through on away goals.
A further consequence of that is that if we did play one of our rearranged games on Tuesday March 25th, it would be only 2 days after we've played Swansea. We can't play a home game on March 26th as Liverpool are at home.