Norwich are 2-0 down at United as I post this so if they don't pick up anything there...
If we don't get any more points, and assuming out goal difference doesn't drop by 10, two of the following things would have to occur for us to go down:
Norwich need a win and a draw from Chelsea (A) and Arsenal (H).
Fulham need two wins against Stoke (A) and Crystal Palace (H).
Cardiff need two wins from Sunderland (A), Newcastle (A) and Chelsea (H).
Sunderland need two wins (and possibly a draw depending on GD compared to us) from Cardiff (H), Manchester United (A), West Brom (H), Swansea (H).