Celtic's Europa League hopes are in ruins after Marcus Berg's second-half goal gave Hamburg a 1-0 victory in their Group C clash at Parkhead.
The Hoops matched the visitors in the first half but failed to convert several decent chances, and in the 63rd minute Berg claimed the points when he took a Ze Roberto pass before drilling his shot from distance past Artur Boruc.
Celtic remain bottom of the table with one point from three matches.
The Hoops created their first clear chance in the 13th minute when Shaun Maloney's corner found its way to the back post, where Scott Brown sliced wide from six yards.
Hamburg immediately made their first real opportunity when Jonathan Pitroipa cut the ball back for Berg but the Swede's scuffed shot trundled wide.
Pitroipa curled a shot into Boruc's arms after an exchange of passes with Ze Roberto and Marcell Jansen volleyed high and wide after being picked out by the Brazilian after the Celtic goalkeeper threw the ball straight back to Hamburg.
Berg headed over from eight yards after a corner by Dennis Aogo, who soon curled a free-kick just over from 30 yards.
N'Guemo's header then found Maloney onside and unmarked 10 yards out after Aiden McGeady's cross had been half cleared, but the Scotland winger could only hook the ball across the face of goal.
Hamburg came closer in the 51st minute when Eljero Elia, who scored the winner for Holland against Scotland last month, lashed against the bar from 15 yards after clever play by Pitroipa.
Celtic failed to heed the warning though as Berg finished brilliantly. Ze Roberto burst clear of the Celtic midfield after Pitroipa chested down a long ball and fed Berg, who fired first time into the bottom corner from 20 yards.
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