West Ham's perfect start to the Europa League came to an end as Olympiacos held on for a 2-1 win in Athens.
Konstantinos Fortounis put the hosts in front before Angelo Ogbonna turned into his own net before the break, to leave David Moyes' side facing a huge task in the second-half.
Lucas Paqueta's volley gave them hope of a late comeback, but an equaliser did not come as West Ham's 17-match unbeaten run in Europe cam to an end.
Here's how David Moyes's side rated in Greece...
Alphonse Areola 6
Drafted in with Lukasz Fabianski ill. No chance for either goal.
Thilo Kehrer 5
Nervy start as West Ham struggled to settle in raucous atmosphere.
Konstantinos Mavropanos 5
Ought to have been more at home than any of his team-mates, returning to the city of his birth, but frustrating lack of composure in possession.
Angelo Ogbonna 3
Dreadful attempt at clearance that didn't need to be made ended in own-goal and crucial Olympiacos cushion before half-time. Booked and maybe a touch fortunate not to receive a second yellow soon after.
Emerson 5
Made a decent chance for Ings after the break and did drive the Hammers forward on occasion.
Tomas Soucek 5
Had started well in breaking up the midfield play but too passive as Fortounis waltzed through midfield to score opener. Nuisance presence up top late on.
James Ward-Prowse 5
Like Soucek, guilty of standing off for the home side's opening goal.
Mohammed Kudus 5
West Ham's likeliest outlet on the counter-attack but faded. Deserves a chance in a full-strength side.
Pablo Fornals 4
Ineffective on the left flank, down which Olympiacos had plenty of joy. Failed to get tight enough to Rodinei for cross which led to second goal.
Said Benrahma 5
Surprisingly deployed in the No10 role but experiment didn't really work.
Danny Ings 4
Fed off scraps, though did have a decent chance deep into first-half stoppage time. Spooned over from Emerson's cross after the break.
Substitues
Lucas Paqueta (Fornals 57') 7
Absolutely walloped home on the volley. Terrific hit.
Jarrod Bowen (Benrahma 58') 6
Unable to continue his terrific run of goals on the road.
Michail Antonio (Ings 58') 6
Made his presence felt with barge on Porozo, which earned booking. Cross created indecision for Paqueta goal.
Maxwel Cornet (Kudus 72') 5
Couldn't really get into the game down the left.
Edson Alvarez (Ward-Prowse 72') 6
Twisted inside out by Alexandropoulos but did just enough to put midfielder off a third.
Unused: Anang, Cresswell, Johnson, Zouma, Aguerd, Mubama
