The Belgian departed the game prematurely after a clash with Antonio Rudiger left him with a broken nose and fractured orbital bone below his left eye.
City eventually lost the match 1-0 after Kai Havertz's decisive goal.
"I remember some chances in the first-half," De Bruyne told reporters. "After the collision I don't remember a lot, how I got into the hospital.
"I remember going back in the morning to the hotel at 10am still with my kit on. In sport it happens. It's not the best thing to happen but you get on with it."
He added: He said: "I don't remember after the incident so there are not a lot of memories. We always try to maintain a high level, we always want to compete for titles, we did well last season - two semis and a final.
"These games you can lose, the opposition are very good, that night we lost and move on. In the Euros I was happy I could come back but the ankle injury happened. There's nothing I can do, I got tackled and my ligament snapped.
"I try to get back as best as possible. It took some time, it was a bit painful but I feel much better now and I'm very happy about that."
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