The Magpies' home game against Everton - initially set to kick-off at 7:45pm BST on Wednesday, 3rd April - will now get under way at 7:30pm BST a day earlier, on Tuesday, 2nd April.
And Tottenham Hotspur's visit to St. James' Park on Saturday, 13th April will remain on the same date, but will now kick-off at 12:30pm BST instead of 3pm BST.
Both matches will be broadcast live on TNT Sports.
Any further alterations to United's fixture schedule will be confirmed in due course.