Pep Guardiola hailed the performance of Phil Foden after the youngster was handed a starting chance in Manchester City's Champions League victory over Hoffenheim.
Leroy Sane scored twice as City came from behind to beat the Bundesliga outfit 2-1 at the Etihad Stadium on Wednesday and secure top spot in Group F.
Highly-rated teenager Foden shone in midfield, particularly as City took firm charge of the game in the second half, having been given a long-awaited opportunity by Guardiola following a spate of injuries.
The 18-year-old almost got on the scoresheet himself when he forced a fine save from Oliver Baumann with a fierce left-foot volley.
Guardiola said: "Phil was incredible, the way he played. I would never have doubts about the quality of that guy. It is not just the quality with the ball. He looks skinny, not strong, but he's really, really strong.
"He's an outstanding young player, a huge talent. I think England has a diamond.
"He's special, he has had minutes and in the future will have a lot of them. He played like a real man. He played so good."
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Manchester City have only 15 fit senior players available for Wednesday's Champions League clash with Hoffenheim, manager Pep Guardiola has said.
Playmaker David Silva is the latest addition to an injury list that already includes Sergio Aguero, Kevin De Bruyne, Benjamin Mendy and Claudio Bravo.
"We have 15 players available," Guardiola said at a press conference.
Guardiola revealed that Silva could be out for "a few weeks" with a muscular injury.
Full-back Danilo is also sidelined but Aguero, who has missed the last three games with a groin problem, could return to face Everton at the weekend.
Chelsea head coach Maurizio Sarri and Manchester City boss Pep Guardiola played down the impact of the Blues' 2-0 win over the Premier League champions on the title race.
Goals from N'Golo Kante and David Luiz saw Chelsea inflict City's first loss of the season, ending a 21-match unbeaten run in the league, which saw Guardiola's men relinquish top spot in the table.
Sarri insisted afterwards that Chelsea are still behind City in the pecking order.
The Italian said: "I'm happy for the win because it's difficult to win against Guardiola's team. I know very well they are a step ahead now.
"In a competition of 10 months it's very difficult to cover the gap.
"I think they are at the moment the best team in Europe. We won today, but we have to say we were a bit lucky in the first 25 minutes, because they could score."
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