Lewis became the youngest player to score in their first Champions League start, achieving that at the age of 17 years and 346 days old. That broke the previous mark held by Karim Benzema from 2005.
“What a goal, he’s a fantastic player. He’s so intelligent,” Guardiola told BT Sport about Lewis.
“Apart from the skills, he’s so intelligent, so clever. He understands everything. He made a fantastic goal, high past the goalkeeper, and played really well.
“We have a young squad, we have some older players but it’s a young squad. Julian (Alvarez) is young but top-class, and Rico, and of course, Sergio (Gomez).
“They played in the Champions League against Sevilla, an experienced team, and for prestige, money, everything, it was important.”
Lewis got his start with City already qualified for the last 16 via their group, but the Bury-born defender has top pedigree, having represented England at under-age level and debuting in the Premier League in August, all after joining City as an eight-year-old.
Fellow defender Ruben Dias heaped praise on him, adding: “He’s an enormous talent. He’s been with us a long time.
“For him to get the opportunity of playing practically the full game and to score, you can see his quality. Brilliant things from him, he just needs to keep working.
“At this club it doesn’t matter if it’s a friendly, the Champions League final, or a game in the groups with everything done. We need to push each other, the same as in training.
“It was one of those games, everything is settled in the group, it’s a game in which you need to perform because the rhythm is going with non-stop games.”