Van Gaal named a strong side shortly before Man United’s original match against Bournemouth on Sunday but a security alert over a fake bomb forced officials to abandon the match.
Meanwhile, Manchester City drew 1-1 with Swansea City, ending United’s slim hopes of securing a top four finish, barring a huge swing in goal difference.
The result has led to suggestions that United could rest their star names for the rearranged match ahead of the FA Cup final this weekend but van Gaal will resist the temptation as it could determine when United start their season next time out.
Defeat against Eddie Howe’s side means United will finish sixth, the result of which is entering the Europa League at its third qualifying stage, although winning the FA Cup would see United through into the group stage.
A third qualifying stage would be difficult logistically as United will be playing in a planned pre-season tour of China.
Meanwhile, Bournemouth still have plenty to play for. They can earn an extra £2.5m with victory in Manchester through their final league standing while a draw would see the Cherries pocket an additional £1.25m.