Despite limited playing time, Doku seized his opportunity at Goodison Park, which forced Guardiola to hail his impact.
"I've been so unfair with him in the last games, because I remember the games against Spurs away and Brighton, for example," the City boss told reporters. "Without him it would not be possible, but the only reason that they have not played lately is because we didn't attack in the last games, with wingers - we were more full-backs wide, and more players in the middle like Bournemouth. But it's only my reason. I feel sorry for him and for other ones.
"But today the impact has been much, much better than Old Trafford. Old Trafford was not good, and here the impact was, you know, how the ball dropped the team, and his threat, arriving to the byline. Jeremy in the final third is unstoppable, he's an incredible, incredible football player, and I'm really pleased that today he played really good."