Despite a bright start, the Black Cats fell behind midway through the first half when Jamie Allen converted Viktor Gyokeres’ cutback.
Gyokeres eventually got on the scoresheet in the closing stages when he beat goalkeeper Anthony Patterson with a close-range finish, before Amad netted a late consolation goal in stoppage-time.
Mowbray’s side will now prepare for next weekend’s home game against Stoke.
Here’s how Phil Smith rated the Sunderland players at the CBS Arena:
Mowbray’s side will now prepare for next weekend’s home game against Stoke.