Hertha Berlin are now living on their nerves at the top of Group H after this total collapse in front of their disbelieving home fans.
They must avoid defeat at Stamford Bridge next Wednesday or risk being overtaken by AC Milan who face a difficult trip to Istanbul to face a Galatasary side with new confidence after this win.
The Turks are now in contention to claim a UEFA Cup place with a win over Milan only ninety minutes after ending a 5-0 defeat by Chelsea last week in total disarray.
Hertha actually took the lead in this game but then relaxed to end the game looking very poor indeed.
The discipline of recent wins over Chelsea and Milan at the Olympic stadium was absent as Galatasary staged a fight back that may carry them into battle with the Italian champions with new optimism next week.
Kjetil Rekdal scored the German goal from a 35th minute penalty but the second half saw a Turkish super show.
Hakan Sukur bright the scores level in the 48th minute after he headed in an Emre cross and he hit his second in the 66th minute after a melee in the Berlin goal saw him stab the ball across the line.
Tugay scored the third with a neat finish on the run after being put clear of the home defence by Arif. Okan scored with a deft lob in the few seconds of injury time to embarrass the Bundesliga team.
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