The key as I have said for a while is we keep 3 points clear of United going into the last week after we play Arsenal.
They then have 2 matches and we have 1 and a vastly superior goal difference and then it is in our hands not theirs on the final weekend.
Give them the sniff of winning the last two to pip us to fourth by being - say - just 2 points ahead and we lose control and may miss out whatever we do at Swansea.
Unless United drop points in their next two (as they might) the only way we can do this is to get 4 points minimum from our next 2 games. Get six and it may not even go to the last Sunday which would be nice.
Either way Southampton is a must not lose game, but one I think we can win because they will play openly and go for goals but can be got at round the back.
Pick a team with that in mind, we win. Pick a team with Real Madrid part 2 in mind and who knows?
And if United drop points against Leicester it might not even matter if we lose so in that case we should go for it all the more.