Youssouf Mulumbu curled in a fantastic strike after 85 minutes and the visitors may have even nicked a point with Paul Scharner and Steven Reid going close.
The culprits were Youssouf Mulumbu, who was also on the scoresheet and Mikel Arteta.
Youssouf, however, acknowledged that he had not spoken to his sister for five years.
The club's sporting and technical director, Dan Ashworth, said: "I'm delighted Youssouf has signed another new contract.
His story, like Murnau's, concerns an aging hotel employee — here, Adam (Youssouf Djaoro), a pool attendant — who loses his job.
"It's indeed Youssouf al-Mauritani — real name Abderhamane Ould Mohamed al-Hussein," said a senior security official, who asked not to be quoted by name.
The story turns on a former swimming champion turned hotel pool man, Adam (Youssouf Djaoro), whose world collapses when he loses his job to his only son.
Youssouf said that in one of their last conversations his sister had told him: "Live your life and I'll live mine".
Sejad Salihovic and Demba Ba were on target in the second half for Ralf Rangnick's men, while Cologne had Youssouf Mohamad sent off in the 78th minute.
Youssouf Hersi, a crowd favourite with the Western Sydney Wanderers, will add spark and creativity to the Glory attack, while local boys Dino Djulbic and Richard Garcia return home after some time away.
The central midfielder Youssouf Mulumbu looks a fine import from West Brom and the loan move of his more creative former Baggies team-mate Graham Dorrans has been made permanent.
