The Hammers hit back from 1-0 down to beat TSC Backa Topala 3-1 in the Europa League.
Brighton were undone by an AEK side who made the best of what little they created.
Liverpool marked its return to the Europa League on Thursday with another come-from-behind 3-1 victory, this time over Austrian club LASK in Linz. Luis Díaz had a clinical finish into the roof of the net in the 63rd minute to put the visitors ahead after receiving a low cross from midfielder Ryan Gravenberch, who was given his first start for the Reds since his summer transfer from Bayern Munich. Mohamed Salah came off the bench and completed the second-half comeback with a goal in the 88th minu