Manchester City signed Doku for £55.5million deal from Rennes during the summer transfer window.
Doku was in from the off for Manchester City on Saturday as they came from behind to beat West Ham 3-1.
And the Belgian was able to link up with Julian Alvarez to score his first goal for the Sky Blues.
Pep Guardiola admitted he did not expect Doku to play at such a high level already but the 21-year-old has explained what he has already learned in his few weeks in Manchester.
“I keep on learning - every training session and game,” he said.
“From the last game [Fulham] I learned that you have to be calm. The massive thing is to not lose the ball - I can still improve on that. It’s about being calm on the ball and having confidence and I want to keep improving on that but today was a success.
“It’s a pleasure [playing with new teammates]. I like to play with them of course. On TV they are very good but in real life they are even better.”
On his debut City goal, he added: “We start from the back and build up and look for the free man - [Julian] Alvarez and he looks for me. I try to keep the ball moving, accelerate and go one v one and I decided to shoot. I’m telling it like it’s easy but it’s not. It was a nice goal.”