Southampton manager Ralph Hasenhuttl said Che Adams' first goal for the club was "so important for him"
"When you hear how much the guys were celebrating him as he went into the dressing room, then you know how happy they are he scored," Hasenhuttl said.
"He has always been working hard. He showed the trust we had in him to start him today was the right one."
Manchester City manager Pep Guardiola says he is struggling to understand why his side have lost nine Premier League games this season "We played more than good but it is not enough to win the games," he said.
"We cannot say we are not a team who score goals this season. We are leading in goals. We create a lot of chances. We are a team who concede less - no team conceded as few chances as us but we lost a lot of games.
"It's difficult even for me to find a reason why but you have to insist and talk about the game, the way they play and try to do more, concede as few as possible and score up front."