The winger well and truly announced himself at the Etihad Stadium with a superb attacking display.
The Belgian set up the opener expertly, driving down the left flank before accurately cutting the ball back to Julian Alvarez to fire us ahead after just seven minutes.
Doku remained on the front foot, and almost got his name on the scoresheet, but his curling effort went wide of the post.
The attacking intensity continued and Erling Haaland doubled our lead after 19 minutes, with his ninth league goal of the season, striking powerfully into the bottom corner from 18 yards.
The striker almost claimed his second of the afternoon after the interval, but Jason Steele matched our number nine’s effort to parry to safety.
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Ansu Fati struck back for the visitors after 73 minutes, calmly finishing to half the deficit, before Manuel Akanji was sent off for a second bookable offence, but we remained resolute to claim a crucial three points.
View the best images from the victory via our gallery below.